Default about page is properly translated:
However, when I switch to FAQ/Guidelines, TOS or Privacy tabs, header get back to English:
I suspect, that this is potentially caused by bootstrap that was done in English - I only found out later, that you can change locale for bootstrap. Is there a way to change this after bootstrap?
Have now tested with I18n.enableVerboseLocalizationSession():
it confirms that first screenshot from above is filled from translation keys (therefore translated), while the second screenshot have hardcoded English value and no keys are added by verbose translations… 
No, it’s not hardcoded. It uses different locale keys depending on how you access the page. I already have a fix for it, but didn’t want to commit it before the release of 2.2.
I can confirm this is now fixed in 2.3.0.beta2. Thanks a lot!
Are you sure? I didn’t change anything yet. 
Maybe you only noticed a missing translation, but there’s still something I need to fix. 
Sure. Then it may be due to app.yml change I did last time (but did not rebuild app since then):
LANG: sl_SI.UTF-8
DISCOURSE_DEFAULT_LOCALE: sl
If I understand your previous post, it gets default from here, right?
This is done. From now on server and client will use the same translations.
https://github.com/discourse/discourse/commit/58f72cd439000c99bec03cd6a40099624255056
And I did some house cleaning because I noticed we had some unused translations for “Terms of Service”.
https://github.com/discourse/discourse/commit/98a17edc90114f6a7c5134d8f7313619093eb869
