[ubuntu] Firefox 18.0 update lost local language

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http://ubuntuforums.org – Ubuntu 12.10 64bits. Yesterday periodical update, goes from Firefox 17.0 to 18.0. I am using firefox 17 in Catalan language and I get "you must reinicialize the browser" message. After Firefox reinitilization I lost locale language setting. In firefox About:config I have in "general.useragent.locale" en-US. I changed to "ca" (my locale) In "tools > add-ons > languages" there is NO catalan language pack! but Ubuntu software center, and "system parameters > langage support" are installed catalan preference. How can I ge (Hardware)