Update file.php

Prevents security issue where $file can be an empty string or directory path. If that happens the deletion fails but the directory is left writeable with 0777 permissions. If $file is empty then this is interpreted by chmod as the current director, so root folder of Joomla site is left writeable.
Update file.php
Update file.php
Updating TinyMCE to 4.0.22
[fix][#33637] Untranslated Strings on Joomla! 3.3.0.beta3 Beta
Update en-GB.ini

Add missing language string for My Profile page help screen URL.
Merge pull request #3481 from infograf768/tiny_4.0.22

Updating TinyMCE to 4.0.22
Merge pull request #3485 from Rajoz/patch-1

[#33639] Update en-GB.ini
[#33594] Joomla! 3.3.0.beta2 Missing chosen-sprite@2x.png
Align docblock of JVersion

Light modification of docblock.
Merge pull request #3495 from asika32764/patch-2

Align docblock of JVersion
[#3289] Wrong message for empty contact category list (Fix #3290)
Merge pull request #3448 from fcoulter/staging

Update file.php
Merge remote-tracking branch 'joomla/staging' into 3.3-dev
Prepare 3.3 Release Candidate