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Created attachment 8718289 [details] Screenshot with marked untranslated strings from Ubuntu 15.10 x64 User Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Ubuntu Chromium/48.0.2564.82 Chrome/48.0.2564.82 Safari/537.36 Steps to reproduce: There are some untranslated strings in Russian translation of Mozilla Thunderbird (version 38.5.1 from Ubuntu repositories). This bug confirmed in Ubuntu 15.10 x64 and Lubuntu 15.10 x64. Screenshots are enclosed. Actual results: Main menu > Edit > Preferences: "Show in the messaging menu"; "For messages in all folders"; "Only for messages in my Inbox folder". Expected results: These strings have to be translated in Russian language.
These strings come from "Messaging Menu and Unity Launcher integration" extension, installed by Ubuntu. You should ask Ubuntu Russian translation team to localise them.
Right, if this is cause by an add-on, this bug is invalid.