Language selector and language from URL are different

[ValentinaPC]

Steps to reproduce:

1. Navigate to a page on your Android device i.e. https://addons-dev.allizom.org/en-US/android/themes/
2. Change the language
3. Go back to previous page

Expected results: Language listed in the page footer is the same as the one listed in the page URL.

Actual results: Different results are displayed.

Notes/Issues:

• in the URL is displayed the language from step 1, in the language selector is displayed the language selected at step 2;
• navigating to other pages after step 3 will not change anything;
• refreshing the page will make things turn back to normal;

Verified on FF52(Android 6.0.1). Issue is reproducing all around AMO servers. Video for this issue:

[muffinresearch]

This is typical browser behaviour, you returned to the old language url and the form is set to the same value you set it to when you navigated away.

[tofumatt]

I'm not sure why this is flagged as an enhancement; going back after a language change will reset the language and as @muffinresearch said is standard browser behaviour when a site's locale is in the URL.

I think we can close this; getting around it in any way would be a huge hack.