Fixed that the sidebar may be displayed empty (#15414).

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Fixed that non-GET API requests respond with 422 (#15427).

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extra : convert_revision : svn%3Ae93f8b46-1217-0410-a6f0-8f06a7374b81/trunk%4012311
Updates for 2.4.1 release.

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Don't create duplicate wikis in test (#15420).

Patch by George Gensure.

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Extract generic formatting options to an helper.

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extra : convert_revision : svn%3Ae93f8b46-1217-0410-a6f0-8f06a7374b81/trunk%4012319
Russian wiki syntax help translations by Denis Savitsky (#9442)

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extra : convert_revision : svn%3Ae93f8b46-1217-0410-a6f0-8f06a7374b81/trunk%4012326
use escaping html in Russian wiki_syntax.html (#9442)

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