Various JavaScript improvements, JSLint, jQuery

pt-BR language update

ru: language updates (new strings of the Media Manager)

en/fr: language updates (new strings of the Media Manager)

pt language file updates

This commit adds new strings to the pt files which
have been introduced through the new Media-Manager.
(commit fb46ebd87eb43d5cd9f67f353f6656d0e3a0b196)

de/de-informal/en language file updates

This commit adds new strings to the de/de-informals files which
have been introduced through the new Media-Manager.

All lang.php-files in inside en/de/de-inf

de/de-informal/en language file updates

This commit adds new strings to the de/de-informals files which
have been introduced through the new Media-Manager.

All lang.php-files in inside en/de/de-informal have been
reordered and reformatted.

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media manager design: added icon to resizing handle and changed background colour

empty conf/plugins.local is created if not existing

media manager design: more spacing and some colour changes

Added comment in conf/plugins.local about how disabled files work

Removed tmp_bak array, no need for checking before save if anything changed

media manager design: improved some spacing

media manager design: added headline

Now using io_savefile with locking and added header
when saving plugin.local

Whitespace and brackets cleanup

Usage of 'disabled' file to control plugins deprecated

Plugins with a disabled file will be treated as having an entry (=0) in
conf/plugins.default.php overridable by conf/plugins.local.php

Code cleanup documentation before merge

Function get_plugin_components() moved to extantion manager

issue #61 security fix

issue #59 security fix

Add testcases for search_index

Revert tmp commits

This reverts commit ba6c070edd92ca0fc8a6ee85d51769d64a19ee7c.
This reverts commit 923510088dda99cb2790b15308593e47369d4f01.

tmp

tmp: Introduce sneaky2

Use search_universal in search_index

mediamanager window resize fix