How do i translate FireHelp to my language?

First, you will need a base language. Say we'll base the translation on english. 

On Admin panel , Go to : Settings => Languages => English

And then click on export

You will have an XML File, edit it with your favourite text editor ( Microsoft Word cannot be used, Notepad , Notepad++ or Sublime is preferred)

When you open the file, start editing and replacing information inside the tags only , as follow:

* The editor in the above photo is Sublime Text

When done with the file, save it back and head back to Settings => Language => Add New Language , and choose the file you just edited

When done, the new language will be added to your list of languages

You can set the language as default be clicking the language, then clicking on "Set as Default"