Firefox is in foreign language - how do I get back to English?

Question

''I've put this here for you, because there are so many old & misleading answers elsewhere in Help.''
'''Note '''that many Help pages have a selector in the footer that allows you to select various help translations. This does ''n0t ''switch the entire FF interface language.
'''Note also''' that if you have installed a ''locale switcher'' add-on, that may well be a reason you have switched locale!
Solution:
From the Firefox header,
* > Edit > Preferences
* > Content
* > Languages [Choose]
* > highlight the language you want
* > use [Move Up] to place it first in the list
* > press [OK}
If the language you need is not shown, you can add a language there.
This is described in
[https://support.mozilla.org/en-US/kb/settings-fonts-languages-pop-ups-javascript#w_languages]
If that does not help, you may need to download FF in your language,
[http://www.mozilla.org/en-US/firefox/all.html] - Firefox in your language.
The ''Firefox in your language'' link is also customised for your operating system & language at [http://mzl.la/PBZPEY]
Otherwise, get the appropriate Firefox language support by downloading a language pack extension.
see:
[http://kb.mozillazine.org/Language_packs]

Answer 1

The assumption is that you are in Adobe Reader XI MUI version.
1.  Edit>Preferences>Language
2.  In the Application Language pop up select English
3. In the Preferences window click OK.
4. Close Adobe Reader
5. Launch Adobe Reader
You should now be in English.