New fs2tree template function, iOS MP3 playback bugfix and more

Today's update (e49fef5) brings with it the following changes:

Performance improvements

The folder menu template (element_menu) has been rewritten to use the new fs2tree template function, which should speed it up quite a bit.
Display of forum comments should be faster because the backend database structure has been significantly improved.

A new template function called fs2tree has been added, which is used to convert the array from filesystem template function into a tree structure, which should be useful for template designers.
The translation languages Amharic, Oromo and Swahili has been added.

On Safari (Mac/iOS) autocorrection and autocapitalization was done to the quiz type text, which was unfortunate, as it caused a lot of typing errors which could've been avoided. This behavior has been disabled.
The HTML layout of the filesystem request handler has been improved by using the new fs2tree template function.
Virtualhost and response time has been added to backend web server logs, allowing better monitoring.
The commenting feature was redesigned to avoid a circular foreign-key constraint, allowing improved database backup performance.
The database backup script is now more automation-friendly.

SoundManager was upgraded to version 2.97a.20150601, which should fix the HTML5 MP3 playback issue on iOS/Safari.
An internal error when trying display a message without a sender was fixed.
Tables were missing labels if user interface language was set to Arabic. This has been fixed.
A file-not-found error was triggered if the incomplete Spanish user interface language was used. This has been fixed.