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avoid HTTP image screenshot urls. closes #595

Extension manager: Fix cache extension to be .repo

The dot was missing i.e. the cache files had no real extension at all.

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improved German translation

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enable/disable extensions via AJAX FS#2927

extension manager: some minor tweaks in the info screen

Update action.php

fix bug that only allows admins any AJAX calls

added plugins group to test

show a message when search returns no results

added missing localization

better filename parsing

The filename found in the URL will be used for old plugins missing a
base entry in their plugin.info.txt and lacking a subdirectory inside
the archive as well. This patch mak

better filename parsing

The filename found in the URL will be used for old plugins missing a
base entry in their plugin.info.txt and lacking a subdirectory inside
the archive as well. This patch makes sure possible query strings aren't
included in the filename.

Note: io_download() will also try to get a filename from any
content-disposition header.

If no filename can be found we simply use an md5 sum of the URL and hope
the plugin will contain it's own hint for naming.

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use DOKU_LF

PHP_EOL is platform dependent, so you get in trouble while migrating
between platforms.

remove unneeded try/catch blocks

they were just catching and rethrowing