Add Language Switcher to Vanilla Forum

I want to add a Language Switcher to my Vanilla Forum. The forum interface is already translated to Arabic (the "Arabic Locale" is installed). The Language Switcher/Selector will include Arabic and English Options. When clicking one of the options, the corresponding "language locale" will be loaded and the forum interface will display in the selected language. Note that the content of the forum will remain the same for both languages.