manager / Synchronize terms in de and de-informal

The refshow configuration option wasn't used as described anymore
already in the latest release and after the introduction of the media
usage index the parameter is also no longer relevant for internal
optimization. The only place where it was still used is the no longer
used search_references()-function which is removed here, too.

The refshow configuration option wasn't used as described anymore
already in the latest release and after the introduction of the media
usage index the parameter is also no longer relevant for internal
optimization. The only place where it was still used is the no longer
used search_references()-function which is removed here, too.

Ignore-this: 769ee24569bccddcc109742412d8cfa9

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Ignore-this: 9de87e69b85c8fbc67c79d53c5e7592b

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Ignore-this: 690e100621dca258956775fbdda97451

darcs-hash:20090424133029-488e0-cf9daf4de7a5aaa2384bc554f50bcde8a127415e.gz

Ignore-this: 48436367d7eda69954d9b3ee73ad31b8

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With spell checkers available in all modern browsers, having a spell checker in
DokuWiki's core code is no longer necessary. This patch removes the spell
checking feature. It will be made available as optional plugin.

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