#1214 ACP language editor improved

* editor finds translation issues, new variables, untranslated variables ect, and display appropriate info on files list, also highlight these variables while in edit mode.
* added support for RTL languages when editing (behavior can be controlled by CSS classes langeditor_rtl and langeditor_rtl in config_css)
* removed hardcoded html and added css classes to allow editor styling.
* checked and fixed various vulnerabilities, improved backward compatibility with php 5.3 and overall stability.

![pic1](https://cloud.githubusercontent.com/assets/3224132/4039237/cc8dc854-2cc6-11e4-9fdf-8ac95f547454.jpg)

![pic2](https://cloud.githubusercontent.com/assets/3224132/4039245/0c98f7fc-2cc7-11e4-8ddc-a7defb9b03aa.jpg)

#1214

description updated 2014-October-02