Test typo fix

application/src/test/java/org/thingsboard/server/controller/BaseUserControllerTest.java

@@ -121,7 +121,7 @@ public abstract class BaseUserControllerTest extends AbstractControllerTest {
         user.setEmail(email);
         user.setFirstName(RandomStringUtils.randomAlphabetic(300));
         user.setLastName("Downs");
-        doPost("/api/user", user).andExpect(statusReason(containsString("Validation error: length of firs name must be equal or less than 255")));
+        doPost("/api/user", user).andExpect(statusReason(containsString("Validation error: length of first name must be equal or less than 255")));
         user.setFirstName("Normal name");
         user.setLastName(RandomStringUtils.randomAlphabetic(300));
         doPost("/api/user", user).andExpect(statusReason(containsString("length of last name must be equal or less than 255")));