Since recently, Firefox is displayed in English, and cannot be switched to another language
I used to use Firefox in a non-English language (apologies but I am not much of a linguist). Since a couple of weeks ago Firefox always displays in English, though under "Tools" / "Languages" the item "German" appears as selected. Switching to English explicitly and switching back to German does not help.
I am using Ubuntu 10.04, and my system language is Esperanto. Firefox used to display in that language. If it is no longer available I would prefer German.
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In the past two weeks I did a bit of research but not to much avail. I noticed I had the "Locale Switcher" add on installed, and deactivated it. Switching languages in the "Languages" tab of "Add-ons" still did not work (yes, I restarted every time). I installed the "Quick Locale Switcher 1.7.4" extension (yes, I restarted), and it displays a number of locales in the "Tools" menu; still choosing one has no effect (yes, I restarted).
Then I juggled with Quick Locale Switchers "options", which actually displayed in Esperanto (so I cannot tell you what they say in English). I check the first one (saying more or less that locale switching should affect the user interface) and switched to German (yes, I restarted) -- and it worked! I switched to Esperanto -- and Firefox went to ... English!
After a lot of searching in the Web I found on "https://addons.mozilla.org/en-US/firefox/addon/esperanto-language-pack/" that this pack is "Not available for Firefox 3.6.16". That might explain something (not everything); probably I lost my language when I upgraded from 3.5 to 3.6.
Here a little error message could save people hours of their lives...
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I found out that Esperanto is supported again in Firefox 4. I made a test installation, and it worked fine. So I shall use German until Ubuntu switches to Firefox 4.