Languages – dictionary with all available languages. The following columns are displayed in the table:
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Name – language name.
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Slug – language abbreviation.
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Enabled – 1 means this language can be used by users, and 0 means the opposite.
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Default – language which will be as a default to the users. The default language has 1 in this column, all other languages have 0.
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The last column is a cross that allows you to delete rows added by mistake.
To add a new language press button "+" on the left of the directory name and add the language name, slug, choose the enabled option and default option. 
Double-click on the table cell will get you the opportunity to change this cell.