Screenshot of the bug
When you focus on a textarea, say #wpTextbox1 on action=edit (standard editing mode), the keyboard icon appears at the bottom left corner of the textarea. Clicking on the arrow and choosing "More settings" opens up a menu with broken interface messages (see the attached screenshot).
Although this is most likely a platform-independent bug, here are some details about my current platform:
OS: Windows XP Home
Screen resolution: 1024x600px
Login status: logged in to the wiki
Skin: Monobook
Interface language of the wiki: English (en)
Version: unspecified
Severity: major
OS: Windows XP
Platform: PC
Whiteboard: ux
URL: http://www.mediawiki.org/wiki/Project:Sandbox?action=edit
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=49028
Attached: