all the old stuff we held on to for ESR102->ESR115 transition

note: fixup pref deprecated in FF119 but removed in AF118 - it's not important if it's not reset, and is in arkenfox-cleanup.js for purists

remove yet another useless ESR102 required notation

pretty sure these are obsolete since https://bugzilla.mozilla.org/show_bug.cgi?id=1692609 in FF102

This pref (in FF118 or lower) was applied regardless of 'intl.accept_languages', but only makes sense when it is "en-US, en" (which we used to set)

But we removed 'intl.accept_language' in this release because there is no longer any RFP formatting protection, so we should no longer decide what language users prefer. Removed so users are not constantly reset on prefsCleaner, which could differ from what the user has/wants and be super annoying

If 'use_us_english' were left active for ESR users who insist on using the live version, this would therefore have their language formatting set to en-US regardless of what they request - which would be annoying/confusing if they weren't requesting english

and herein ends my story - make it inactive

tor project link doesn't say anything, it's all in the related bugzilla