String Localization
When editing strings in a game variant, it is usually possible to provide translations into multiple languages. (In some cases, this feature is not available due to technical limitations in the game variant file format.) Additionally, there is a "Library" button that you can click to access the localized string library, a collection of translations pulled from official Bungie content — both existing game variants and the base map files.

The string library is shown below.

The lefthand column has a list of all available strings, along with a search box.
The righthand column allows you to preview the text of a given string in any supported language. Additionally, some strings allow you to specify options. As an example, the "x Points" string allows you to substitute in any number, with plurals handled for each language.
Several strings also have more detailed descriptions, which may contain notes about the context in which the string was used, or information specific to certain languages. For example, the "Turn Clock" string in Portugese is "Chess Clock," and this is noted in the description.