wp admin - Unable to change blog language in multisite

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tl;dr No matter what I select in Site Language:

After hitting Save this value is always reset to English (United States). Where or what should I be looking for to resolve this?

I was playing a little bit around get_blog_details() and I have noticed that I am getting lang_id field set to 0 for each and every of my blogs even though I have a multi-language multisite blog network.

I quick investigation revealed that I truly have all languages set to English (United States), everywhere, for every blog. A little bit longer query have revealed that no matter what I set in that field, I will always have it reset to English (United States).

Some more details:

1. If I select any language that is listed in Available group then that language is installed (added to Installed group), but again language is reset to English (United States).

2. If I select any language that is listed in Installed group then nothing happens (language is set to English (United States) after clicking Save).

Is there any workaround? I mean any:

1. Does anyone recall or recognize such situation and have a cure?
2. Can I force blog language programmatically (from PHP, i.e. from some plugin)?

_{This is not a duplicate of this one! I have more than just English (United States) language listed. The problem is that I cannot change to any other.}

本文标签： wp adminUnable to change blog language in multisite