Merged r12311 (#15427).

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Merged r12310 (#15414).

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Merged r12314.

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tagged version 2.4.1

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Merged r12326 from trunk to 2.4-stable (#9442)

Russian wiki syntax help translations by Denis Savitsky.

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Merged r12331 from trunk to 2.4-stable (#9442)

use escaping html in Russian wiki_syntax.html.

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