diff --git a/npm/ng-packs/packages/core/src/lib/services/localization.service.ts b/npm/ng-packs/packages/core/src/lib/services/localization.service.ts
index 5fea751b14..8708eecfdb 100644
--- a/npm/ng-packs/packages/core/src/lib/services/localization.service.ts
+++ b/npm/ng-packs/packages/core/src/lib/services/localization.service.ts
@@ -7,7 +7,7 @@ import { SetLanguage } from '../actions/session.actions';
 import { Config } from '../models/config';
 import { ConfigState } from '../states/config.state';
 import { registerLocale } from '../utils/initial-utils';
-import { localize, localizeWithFallback } from '../utils/localization-utils';
+import { createLocalizer, createLocalizerWithFallback } from '../utils/localization-utils';
 
 type ShouldReuseRoute = (future: ActivatedRouteSnapshot, curr: ActivatedRouteSnapshot) => boolean;
 
@@ -79,17 +79,15 @@ export class LocalizationService {
   }
 
   localize(resourceName: string, key: string, defaultValue: string): Observable<string> {
-    return this.store
-      .select(ConfigState.getOne('localization'))
-      .pipe(map(localize(resourceName, key, defaultValue)));
+    return this.store.select(ConfigState.getOne('localization')).pipe(
+      map(createLocalizer),
+      map(localize => localize(resourceName, key, defaultValue)),
+    );
   }
 
   localizeSync(resourceName: string, key: string, defaultValue: string): string {
-    return localize(
-      resourceName,
-      key,
-      defaultValue,
-    )(this.store.selectSnapshot(ConfigState.getOne('localization')));
+    const localization = this.store.selectSnapshot(ConfigState.getOne('localization'));
+    return createLocalizer(localization)(resourceName, key, defaultValue);
   }
 
   localizeWithFallback(
@@ -97,16 +95,14 @@ export class LocalizationService {
     keys: string[],
     defaultValue: string,
   ): Observable<string> {
-    return this.store
-      .select(ConfigState.getOne('localization'))
-      .pipe(map(localizeWithFallback(resourceNames, keys, defaultValue)));
+    return this.store.select(ConfigState.getOne('localization')).pipe(
+      map(createLocalizerWithFallback),
+      map(localizeWithFallback => localizeWithFallback(resourceNames, keys, defaultValue)),
+    );
   }
 
   localizeWithFallbackSync(resourceNames: string[], keys: string[], defaultValue: string): string {
-    return localizeWithFallback(
-      resourceNames,
-      keys,
-      defaultValue,
-    )(this.store.selectSnapshot(ConfigState.getOne('localization')));
+    const localization = this.store.selectSnapshot(ConfigState.getOne('localization'));
+    return createLocalizerWithFallback(localization)(resourceNames, keys, defaultValue);
   }
 }
diff --git a/npm/ng-packs/packages/core/src/lib/tests/localization-utils.spec.ts b/npm/ng-packs/packages/core/src/lib/tests/localization-utils.spec.ts
new file mode 100644
index 0000000000..f8bead7eda
--- /dev/null
+++ b/npm/ng-packs/packages/core/src/lib/tests/localization-utils.spec.ts
@@ -0,0 +1,90 @@
+import { createLocalizer, createLocalizerWithFallback } from '../utils/localization-utils';
+
+describe('Localization Utils', () => {
+  describe('#createLocalizer', () => {
+    const localize = createLocalizer({
+      values: { foo: { bar: 'baz' }, x: { y: 'z' } },
+      defaultResourceName: 'x',
+      currentCulture: null,
+      languages: [],
+    });
+
+    test.each`
+      resource     | key          | defaultValue | expected
+      ${'_'}       | ${'TEST'}    | ${'DEFAULT'} | ${'TEST'}
+      ${'foo'}     | ${'bar'}     | ${'DEFAULT'} | ${'baz'}
+      ${'x'}       | ${'bar'}     | ${'DEFAULT'} | ${'DEFAULT'}
+      ${'a'}       | ${'bar'}     | ${'DEFAULT'} | ${'DEFAULT'}
+      ${''}        | ${'bar'}     | ${'DEFAULT'} | ${'DEFAULT'}
+      ${undefined} | ${'bar'}     | ${'DEFAULT'} | ${'DEFAULT'}
+      ${'foo'}     | ${'y'}       | ${'DEFAULT'} | ${'DEFAULT'}
+      ${'x'}       | ${'y'}       | ${'DEFAULT'} | ${'z'}
+      ${'a'}       | ${'y'}       | ${'DEFAULT'} | ${'DEFAULT'}
+      ${''}        | ${'y'}       | ${'DEFAULT'} | ${'DEFAULT'}
+      ${undefined} | ${'y'}       | ${'DEFAULT'} | ${'DEFAULT'}
+      ${'foo'}     | ${''}        | ${'DEFAULT'} | ${'DEFAULT'}
+      ${'x'}       | ${''}        | ${'DEFAULT'} | ${'DEFAULT'}
+      ${'a'}       | ${''}        | ${'DEFAULT'} | ${'DEFAULT'}
+      ${''}        | ${''}        | ${'DEFAULT'} | ${'DEFAULT'}
+      ${undefined} | ${''}        | ${'DEFAULT'} | ${'DEFAULT'}
+      ${'foo'}     | ${undefined} | ${'DEFAULT'} | ${'DEFAULT'}
+      ${'x'}       | ${undefined} | ${'DEFAULT'} | ${'DEFAULT'}
+      ${'a'}       | ${undefined} | ${'DEFAULT'} | ${'DEFAULT'}
+      ${''}        | ${undefined} | ${'DEFAULT'} | ${'DEFAULT'}
+      ${undefined} | ${undefined} | ${'DEFAULT'} | ${'DEFAULT'}
+    `(
+      'should return $expected when resource name is $resource and key is $key',
+      ({ resource, key, defaultValue, expected }) => {
+        const result = localize(resource, key, defaultValue);
+
+        expect(result).toBe(expected);
+      },
+    );
+  });
+
+  describe('#createLocalizerWithFallback', () => {
+    const localizeWithFallback = createLocalizerWithFallback({
+      values: { foo: { bar: 'baz' }, x: { y: 'z' } },
+      defaultResourceName: 'x',
+      currentCulture: null,
+      languages: [],
+    });
+
+    test.each`
+      resources          | keys                 | defaultValue | expected
+      ${['', '_']}       | ${['TEST', 'OTHER']} | ${'DEFAULT'} | ${'TEST'}
+      ${['foo']}         | ${['bar']}           | ${'DEFAULT'} | ${'baz'}
+      ${['x']}           | ${['bar']}           | ${'DEFAULT'} | ${'DEFAULT'}
+      ${['a', 'b', 'c']} | ${['bar']}           | ${'DEFAULT'} | ${'DEFAULT'}
+      ${['']}            | ${['bar']}           | ${'DEFAULT'} | ${'DEFAULT'}
+      ${[]}              | ${['bar']}           | ${'DEFAULT'} | ${'DEFAULT'}
+      ${['foo']}         | ${['y']}             | ${'DEFAULT'} | ${'z'}
+      ${['x']}           | ${['y']}             | ${'DEFAULT'} | ${'z'}
+      ${['a', 'b', 'c']} | ${['y']}             | ${'DEFAULT'} | ${'z'}
+      ${['']}            | ${['y']}             | ${'DEFAULT'} | ${'z'}
+      ${[]}              | ${['y']}             | ${'DEFAULT'} | ${'z'}
+      ${['foo']}         | ${['bar', 'y']}      | ${'DEFAULT'} | ${'baz'}
+      ${['x']}           | ${['bar', 'y']}      | ${'DEFAULT'} | ${'z'}
+      ${['a', 'b', 'c']} | ${['bar', 'y']}      | ${'DEFAULT'} | ${'z'}
+      ${['']}            | ${['bar', 'y']}      | ${'DEFAULT'} | ${'z'}
+      ${[]}              | ${['bar', 'y']}      | ${'DEFAULT'} | ${'z'}
+      ${['foo']}         | ${['']}              | ${'DEFAULT'} | ${'DEFAULT'}
+      ${['x']}           | ${['']}              | ${'DEFAULT'} | ${'DEFAULT'}
+      ${['a', 'b', 'c']} | ${['']}              | ${'DEFAULT'} | ${'DEFAULT'}
+      ${['']}            | ${['']}              | ${'DEFAULT'} | ${'DEFAULT'}
+      ${[]}              | ${['']}              | ${'DEFAULT'} | ${'DEFAULT'}
+      ${['foo']}         | ${[]}                | ${'DEFAULT'} | ${'DEFAULT'}
+      ${['x']}           | ${[]}                | ${'DEFAULT'} | ${'DEFAULT'}
+      ${['a', 'b', 'c']} | ${[]}                | ${'DEFAULT'} | ${'DEFAULT'}
+      ${['']}            | ${[]}                | ${'DEFAULT'} | ${'DEFAULT'}
+      ${[]}              | ${[]}                | ${'DEFAULT'} | ${'DEFAULT'}
+    `(
+      'should return $expected when resource names are $resources and keys are $keys',
+      ({ resources, keys, defaultValue, expected }) => {
+        const result = localizeWithFallback(resources, keys, defaultValue);
+
+        expect(result).toBe(expected);
+      },
+    );
+  });
+});
diff --git a/npm/ng-packs/packages/core/src/lib/tests/localization.service.spec.ts b/npm/ng-packs/packages/core/src/lib/tests/localization.service.spec.ts
index e17d53e463..9d6f6ba3bf 100644
--- a/npm/ng-packs/packages/core/src/lib/tests/localization.service.spec.ts
+++ b/npm/ng-packs/packages/core/src/lib/tests/localization.service.spec.ts
@@ -79,6 +79,7 @@ describe('LocalizationService', () => {
   describe('#localize', () => {
     test.each`
       resource     | key          | defaultValue | expected
+      ${'_'}       | ${'TEST'}    | ${'DEFAULT'} | ${'TEST'}
       ${'foo'}     | ${'bar'}     | ${'DEFAULT'} | ${'baz'}
       ${'x'}       | ${'bar'}     | ${'DEFAULT'} | ${'DEFAULT'}
       ${'a'}       | ${'bar'}     | ${'DEFAULT'} | ${'DEFAULT'}
@@ -119,6 +120,7 @@ describe('LocalizationService', () => {
   describe('#localizeSync', () => {
     test.each`
       resource     | key          | defaultValue | expected
+      ${'_'}       | ${'TEST'}    | ${'DEFAULT'} | ${'TEST'}
       ${'foo'}     | ${'bar'}     | ${'DEFAULT'} | ${'baz'}
       ${'x'}       | ${'bar'}     | ${'DEFAULT'} | ${'DEFAULT'}
       ${'a'}       | ${'bar'}     | ${'DEFAULT'} | ${'DEFAULT'}
@@ -156,32 +158,33 @@ describe('LocalizationService', () => {
 
   describe('#localizeWithFallback', () => {
     test.each`
-      resources          | keys            | defaultValue | expected
-      ${['foo']}         | ${['bar']}      | ${'DEFAULT'} | ${'baz'}
-      ${['x']}           | ${['bar']}      | ${'DEFAULT'} | ${'DEFAULT'}
-      ${['a', 'b', 'c']} | ${['bar']}      | ${'DEFAULT'} | ${'DEFAULT'}
-      ${['']}            | ${['bar']}      | ${'DEFAULT'} | ${'DEFAULT'}
-      ${[]}              | ${['bar']}      | ${'DEFAULT'} | ${'DEFAULT'}
-      ${['foo']}         | ${['y']}        | ${'DEFAULT'} | ${'z'}
-      ${['x']}           | ${['y']}        | ${'DEFAULT'} | ${'z'}
-      ${['a', 'b', 'c']} | ${['y']}        | ${'DEFAULT'} | ${'z'}
-      ${['']}            | ${['y']}        | ${'DEFAULT'} | ${'z'}
-      ${[]}              | ${['y']}        | ${'DEFAULT'} | ${'z'}
-      ${['foo']}         | ${['bar', 'y']} | ${'DEFAULT'} | ${'baz'}
-      ${['x']}           | ${['bar', 'y']} | ${'DEFAULT'} | ${'z'}
-      ${['a', 'b', 'c']} | ${['bar', 'y']} | ${'DEFAULT'} | ${'z'}
-      ${['']}            | ${['bar', 'y']} | ${'DEFAULT'} | ${'z'}
-      ${[]}              | ${['bar', 'y']} | ${'DEFAULT'} | ${'z'}
-      ${['foo']}         | ${['']}         | ${'DEFAULT'} | ${'DEFAULT'}
-      ${['x']}           | ${['']}         | ${'DEFAULT'} | ${'DEFAULT'}
-      ${['a', 'b', 'c']} | ${['']}         | ${'DEFAULT'} | ${'DEFAULT'}
-      ${['']}            | ${['']}         | ${'DEFAULT'} | ${'DEFAULT'}
-      ${[]}              | ${['']}         | ${'DEFAULT'} | ${'DEFAULT'}
-      ${['foo']}         | ${[]}           | ${'DEFAULT'} | ${'DEFAULT'}
-      ${['x']}           | ${[]}           | ${'DEFAULT'} | ${'DEFAULT'}
-      ${['a', 'b', 'c']} | ${[]}           | ${'DEFAULT'} | ${'DEFAULT'}
-      ${['']}            | ${[]}           | ${'DEFAULT'} | ${'DEFAULT'}
-      ${[]}              | ${[]}           | ${'DEFAULT'} | ${'DEFAULT'}
+      resources          | keys                 | defaultValue | expected
+      ${['', '_']}       | ${['TEST', 'OTHER']} | ${'DEFAULT'} | ${'TEST'}
+      ${['foo']}         | ${['bar']}           | ${'DEFAULT'} | ${'baz'}
+      ${['x']}           | ${['bar']}           | ${'DEFAULT'} | ${'DEFAULT'}
+      ${['a', 'b', 'c']} | ${['bar']}           | ${'DEFAULT'} | ${'DEFAULT'}
+      ${['']}            | ${['bar']}           | ${'DEFAULT'} | ${'DEFAULT'}
+      ${[]}              | ${['bar']}           | ${'DEFAULT'} | ${'DEFAULT'}
+      ${['foo']}         | ${['y']}             | ${'DEFAULT'} | ${'z'}
+      ${['x']}           | ${['y']}             | ${'DEFAULT'} | ${'z'}
+      ${['a', 'b', 'c']} | ${['y']}             | ${'DEFAULT'} | ${'z'}
+      ${['']}            | ${['y']}             | ${'DEFAULT'} | ${'z'}
+      ${[]}              | ${['y']}             | ${'DEFAULT'} | ${'z'}
+      ${['foo']}         | ${['bar', 'y']}      | ${'DEFAULT'} | ${'baz'}
+      ${['x']}           | ${['bar', 'y']}      | ${'DEFAULT'} | ${'z'}
+      ${['a', 'b', 'c']} | ${['bar', 'y']}      | ${'DEFAULT'} | ${'z'}
+      ${['']}            | ${['bar', 'y']}      | ${'DEFAULT'} | ${'z'}
+      ${[]}              | ${['bar', 'y']}      | ${'DEFAULT'} | ${'z'}
+      ${['foo']}         | ${['']}              | ${'DEFAULT'} | ${'DEFAULT'}
+      ${['x']}           | ${['']}              | ${'DEFAULT'} | ${'DEFAULT'}
+      ${['a', 'b', 'c']} | ${['']}              | ${'DEFAULT'} | ${'DEFAULT'}
+      ${['']}            | ${['']}              | ${'DEFAULT'} | ${'DEFAULT'}
+      ${[]}              | ${['']}              | ${'DEFAULT'} | ${'DEFAULT'}
+      ${['foo']}         | ${[]}                | ${'DEFAULT'} | ${'DEFAULT'}
+      ${['x']}           | ${[]}                | ${'DEFAULT'} | ${'DEFAULT'}
+      ${['a', 'b', 'c']} | ${[]}                | ${'DEFAULT'} | ${'DEFAULT'}
+      ${['']}            | ${[]}                | ${'DEFAULT'} | ${'DEFAULT'}
+      ${[]}              | ${[]}                | ${'DEFAULT'} | ${'DEFAULT'}
     `(
       'should return observable $expected when resource names are $resources and keys are $keys',
       async ({ resources, keys, defaultValue, expected }) => {
@@ -203,32 +206,33 @@ describe('LocalizationService', () => {
 
   describe('#localizeWithFallbackSync', () => {
     test.each`
-      resources          | keys            | defaultValue | expected
-      ${['foo']}         | ${['bar']}      | ${'DEFAULT'} | ${'baz'}
-      ${['x']}           | ${['bar']}      | ${'DEFAULT'} | ${'DEFAULT'}
-      ${['a', 'b', 'c']} | ${['bar']}      | ${'DEFAULT'} | ${'DEFAULT'}
-      ${['']}            | ${['bar']}      | ${'DEFAULT'} | ${'DEFAULT'}
-      ${[]}              | ${['bar']}      | ${'DEFAULT'} | ${'DEFAULT'}
-      ${['foo']}         | ${['y']}        | ${'DEFAULT'} | ${'z'}
-      ${['x']}           | ${['y']}        | ${'DEFAULT'} | ${'z'}
-      ${['a', 'b', 'c']} | ${['y']}        | ${'DEFAULT'} | ${'z'}
-      ${['']}            | ${['y']}        | ${'DEFAULT'} | ${'z'}
-      ${[]}              | ${['y']}        | ${'DEFAULT'} | ${'z'}
-      ${['foo']}         | ${['bar', 'y']} | ${'DEFAULT'} | ${'baz'}
-      ${['x']}           | ${['bar', 'y']} | ${'DEFAULT'} | ${'z'}
-      ${['a', 'b', 'c']} | ${['bar', 'y']} | ${'DEFAULT'} | ${'z'}
-      ${['']}            | ${['bar', 'y']} | ${'DEFAULT'} | ${'z'}
-      ${[]}              | ${['bar', 'y']} | ${'DEFAULT'} | ${'z'}
-      ${['foo']}         | ${['']}         | ${'DEFAULT'} | ${'DEFAULT'}
-      ${['x']}           | ${['']}         | ${'DEFAULT'} | ${'DEFAULT'}
-      ${['a', 'b', 'c']} | ${['']}         | ${'DEFAULT'} | ${'DEFAULT'}
-      ${['']}            | ${['']}         | ${'DEFAULT'} | ${'DEFAULT'}
-      ${[]}              | ${['']}         | ${'DEFAULT'} | ${'DEFAULT'}
-      ${['foo']}         | ${[]}           | ${'DEFAULT'} | ${'DEFAULT'}
-      ${['x']}           | ${[]}           | ${'DEFAULT'} | ${'DEFAULT'}
-      ${['a', 'b', 'c']} | ${[]}           | ${'DEFAULT'} | ${'DEFAULT'}
-      ${['']}            | ${[]}           | ${'DEFAULT'} | ${'DEFAULT'}
-      ${[]}              | ${[]}           | ${'DEFAULT'} | ${'DEFAULT'}
+      resources          | keys                 | defaultValue | expected
+      ${['', '_']}       | ${['TEST', 'OTHER']} | ${'DEFAULT'} | ${'TEST'}
+      ${['foo']}         | ${['bar']}           | ${'DEFAULT'} | ${'baz'}
+      ${['x']}           | ${['bar']}           | ${'DEFAULT'} | ${'DEFAULT'}
+      ${['a', 'b', 'c']} | ${['bar']}           | ${'DEFAULT'} | ${'DEFAULT'}
+      ${['']}            | ${['bar']}           | ${'DEFAULT'} | ${'DEFAULT'}
+      ${[]}              | ${['bar']}           | ${'DEFAULT'} | ${'DEFAULT'}
+      ${['foo']}         | ${['y']}             | ${'DEFAULT'} | ${'z'}
+      ${['x']}           | ${['y']}             | ${'DEFAULT'} | ${'z'}
+      ${['a', 'b', 'c']} | ${['y']}             | ${'DEFAULT'} | ${'z'}
+      ${['']}            | ${['y']}             | ${'DEFAULT'} | ${'z'}
+      ${[]}              | ${['y']}             | ${'DEFAULT'} | ${'z'}
+      ${['foo']}         | ${['bar', 'y']}      | ${'DEFAULT'} | ${'baz'}
+      ${['x']}           | ${['bar', 'y']}      | ${'DEFAULT'} | ${'z'}
+      ${['a', 'b', 'c']} | ${['bar', 'y']}      | ${'DEFAULT'} | ${'z'}
+      ${['']}            | ${['bar', 'y']}      | ${'DEFAULT'} | ${'z'}
+      ${[]}              | ${['bar', 'y']}      | ${'DEFAULT'} | ${'z'}
+      ${['foo']}         | ${['']}              | ${'DEFAULT'} | ${'DEFAULT'}
+      ${['x']}           | ${['']}              | ${'DEFAULT'} | ${'DEFAULT'}
+      ${['a', 'b', 'c']} | ${['']}              | ${'DEFAULT'} | ${'DEFAULT'}
+      ${['']}            | ${['']}              | ${'DEFAULT'} | ${'DEFAULT'}
+      ${[]}              | ${['']}              | ${'DEFAULT'} | ${'DEFAULT'}
+      ${['foo']}         | ${[]}                | ${'DEFAULT'} | ${'DEFAULT'}
+      ${['x']}           | ${[]}                | ${'DEFAULT'} | ${'DEFAULT'}
+      ${['a', 'b', 'c']} | ${[]}                | ${'DEFAULT'} | ${'DEFAULT'}
+      ${['']}            | ${[]}                | ${'DEFAULT'} | ${'DEFAULT'}
+      ${[]}              | ${[]}                | ${'DEFAULT'} | ${'DEFAULT'}
     `(
       'should return $expected when resource names are $resources and keys are $keys',
       ({ resources, keys, defaultValue, expected }) => {
diff --git a/npm/ng-packs/packages/core/src/lib/utils/index.ts b/npm/ng-packs/packages/core/src/lib/utils/index.ts
index 6f6b0585d9..4dde8134ef 100644
--- a/npm/ng-packs/packages/core/src/lib/utils/index.ts
+++ b/npm/ng-packs/packages/core/src/lib/utils/index.ts
@@ -3,6 +3,7 @@ export * from './form-utils';
 export * from './generator-utils';
 export * from './initial-utils';
 export * from './lazy-load-utils';
+export * from './localization-utils';
 export * from './number-utils';
 export * from './route-utils';
 export * from './rxjs-utils';
diff --git a/npm/ng-packs/packages/core/src/lib/utils/localization-utils.ts b/npm/ng-packs/packages/core/src/lib/utils/localization-utils.ts
index 2a14b8d014..31a73b818d 100644
--- a/npm/ng-packs/packages/core/src/lib/utils/localization-utils.ts
+++ b/npm/ng-packs/packages/core/src/lib/utils/localization-utils.ts
@@ -1,8 +1,8 @@
 import { ApplicationConfiguration } from '../models/application-configuration';
 
-export function localize(resourceName: string, key: string, defaultValue: string) {
+export function createLocalizer(localization: ApplicationConfiguration.Localization) {
   /* tslint:disable-next-line:only-arrow-functions */
-  return function(localization: ApplicationConfiguration.Localization) {
+  return function(resourceName: string, key: string, defaultValue: string) {
     if (resourceName === '_') return key;
 
     const resource = localization.values[resourceName];
@@ -13,13 +13,20 @@ export function localize(resourceName: string, key: string, defaultValue: string
   };
 }
 
-export function localizeWithFallback(
-  resourceNames: string[],
-  keys: string[],
-  defaultValue: string,
-) {
+export function createLocalizerWithFallback(localization: ApplicationConfiguration.Localization) {
+  const findLocalization = createLocalizationFinder(localization);
   /* tslint:disable-next-line:only-arrow-functions */
-  return function(localization: ApplicationConfiguration.Localization) {
+  return function(resourceNames: string[], keys: string[], defaultValue: string) {
+    const { localized } = findLocalization(resourceNames, keys);
+    return localized || defaultValue;
+  };
+}
+
+function createLocalizationFinder(localization: ApplicationConfiguration.Localization) {
+  const localize = createLocalizer(localization);
+
+  /* tslint:disable-next-line:only-arrow-functions */
+  return function(resourceNames: string[], keys: string[]) {
     resourceNames = resourceNames.concat(localization.defaultResourceName).filter(Boolean);
 
     const resourceCount = resourceNames.length;
@@ -29,11 +36,12 @@ export function localizeWithFallback(
       const resourceName = resourceNames[i];
 
       for (let j = 0; j < keyCount; j++) {
-        const localized = localize(resourceName, keys[j], null)(localization);
-        if (localized) return localized;
+        const key = keys[j];
+        const localized = localize(resourceName, key, null);
+        if (localized) return { resourceName, key, localized };
       }
     }
 
-    return defaultValue;
+    return { resourceName: undefined, key: undefined, localized: undefined };
   };
 }