Less restrictive plugin name checking

This partially reverts de50cad65ae679a602e71adddffdd74df7ea3fbb as the
strict check breaks existing plugins and this shouldn't be changed
without prior discussi

Less restrictive plugin name checking

This partially reverts de50cad65ae679a602e71adddffdd74df7ea3fbb as the
strict check breaks existing plugins and this shouldn't be changed
without prior discussion and a warning for plugin authors with some time
to adjust their plugins. Now all characters that are valid in PHP class
names except "_" are allowed.

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Fix encoding of special characters in HTML mails FS#2590

Before this change it was possible to send arbitrary HTML content to
subscribers, if you are using HTML subscription mails and have
untrustwo

Fix encoding of special characters in HTML mails FS#2590

Before this change it was possible to send arbitrary HTML content to
subscribers, if you are using HTML subscription mails and have
untrustworthy editors, it is recommended to upgrade as soon as possible
(this doesn't affect the current stable release).

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Display an error message when an enabled plugin has an invalid name

This displays an error message when building the plugin list and an
enabled plugin does not follow the plugin naming conventions.

Display an error message when an enabled plugin has an invalid name

This displays an error message when building the plugin list and an
enabled plugin does not follow the plugin naming conventions. This
should help plugin developers and admins understand why their plugins
aren't working.

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Use hardcoded plugin loading error message as $lang isn't initialized

When loading plugins, $lang might not be initialized yet, so use a
hardcoded error message instead, especially as this error sho

Use hardcoded plugin loading error message as $lang isn't initialized

When loading plugins, $lang might not be initialized yet, so use a
hardcoded error message instead, especially as this error should only be
displayed for the admin (and then fixed). This also removes the
previously localized message, it might be re-added as part of the new
extension manager.

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Check plugin naming conventions during load FS#2464

This checks if plugin names are valid and only loads valid plugin files,
this could prevent some errors from wrong upgrades as described in
FS#246

Check plugin naming conventions during load FS#2464

This checks if plugin names are valid and only loads valid plugin files,
this could prevent some errors from wrong upgrades as described in
FS#2464.

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Remove BOM in linesToHash, partial fix for FS#2464

The BOM at the beginning of some plugin.info.txt files prevented the
plugin manager from correctly reading the base property and thus it
installed

Remove BOM in linesToHash, partial fix for FS#2464

The BOM at the beginning of some plugin.info.txt files prevented the
plugin manager from correctly reading the base property and thus it
installed the plugin in the wrong directory.

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Correct and add some PHPDoc comments, initialize some variables

Fix the test if a subscription already exists FS#2580

This fixes the test for existing subscriptions by not only testing if
the subscription for the deepest namespace level is for the current page
b

Fix the test if a subscription already exists FS#2580

This fixes the test for existing subscriptions by not only testing if
the subscription for the deepest namespace level is for the current page
but by simply testing all levels. Test case is included, it fails
without this change.

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French language update

Spanish language update

spanish language update FS#2586

Finish language update

Traditional Chinese language update

GeSHi upgraded to version 1.0.8.11

Korean language update

Finish language update

Dutch language update

Korean language update

Czech language update

removed data dir security check as suggested in FS#2547

don't call set_magic_quotes_runtime if it doesn't exists FS#2583

this function was removed in PHP 5.4.0

Always disable compression when sitemaps are delivered

The class loader isn't available at that place in inc/init.php so the
check if the sitemap is compressed didn't work.

Remove unused/directly overwritten variable declarations in inc/html.php

Fix/add some PHPDoc comments in inc/html.php

Prevent access to undefined variables and make returns consistent in html.php