This is actually a theme-specific revision, not a core change. I'd suggest opening an issue at https://github.com/nodebb/nodebb-theme-persona/issues and detailing the necessary changes there. Thanks.
Wrong default language
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I noticed on my installation, even one that I just did today, that the default language is set to Arabic and English (US) is not included in the list of language options.
Default language
Choice of language
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Looks like a bug... in that I select the language if a language has been selected, but on new installs, the
defaultLang
is not set, so defaults to english, and highlights the first language, which is arabic