[Mediawiki-i18n] Extension messages are now translatable

[Rotem Liss]

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Extension messages can now be translated. To add localized messages to
an extension, add a second parameter to the call to
MessageCache::addMessages, which includes the language code (the default
value is 'en').

For example, old style:

$wgMessageCache->addMessages( array( 'custom' => 'custom message' ) );

New style:

$wgMessageCache->addMessages( array( 'custom' => 'custom message' ), 'en' );

etc.

You are welcome to translate each extension, especially those which are
used in Wikimedia sites (a list is available in Special:Version), into
your language.

- --
#define Name RotemLiss
#define Mail mailSTRUDELrotemlissDOTcom
#define Site www.rotemliss.com

#define KeyFingerPrint 4AFD 8579 A449 4267 BED9 38E5 6EF8 5B1F EBDE 7AC0
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