Manual:$wgLoginLanguageSelector

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Language, regional and character encoding settings: $wgLoginLanguageSelector
Show a bar of language selection links in the user login and user registration forms.
Introduced in version:1.7.0 (r14901)
Removed in version:still in use
Allowed values:(boolean)
Default value:false

DetailsEdit

Set this to true to show a bar of language selection links in the user login and user registration forms. Edit the "loginlanguagelinks" message to customize these options.