About language translations
Translated strings
The application's forms database includes a set of "strings" tables, which contain translations of the text strings used in form titles, field labels, buttons, and so on. The default strings table, for U.S. English, is named Strings. Other strings tables have names like JapaneseStrings, FrenchStrings, and so on.
The strings table used for each language ID is determined by the settings for the application in the Language IDs form. In the Sites/Entities form, the Forms Database Name should point to the forms database that contains the strings tables you want a specific site to use. This becomes the site default language for all users in that site.
Translated messages
Application message strings are maintained in the ApplicationMessages table. The table includes default text strings in U.S. English and any translations of message strings.
The language used for messages in an application is determined by the Message Language setting in the Language IDs form.