fix default iceweasel spelling language
Originally created by Tails on #5371 (Redmine)
Logged in with the default (English) settings.
Visited an English speaking open-publishing website (http://atlanta.indymedia.org/), started to publish => dictionary is automatically set to French (Luxembourg) in the main textarea.
Looking around on the web, it looks like it’s expected that iceweasel picks any seemingly random dictionary as the default one.
bugfix/fix_default_iceweasel_spelling_language, done in
But the fix is not perfect, see select localized spelling dictionary in Iceweasel.