Add addMultipleTranslation method. And outsourced the methods...
Added addMultipleTranslation method. And outsourced the methods clearLocaleCaches and createStringTranslation. Added tests for the singular translations.
Closes #3351522
Added addMultipleTranslation method. And outsourced the methods clearLocaleCaches and createStringTranslation. Added tests for the singular translations.
Closes #3351522