Trans-quick-start-guide updates

[Manuel Ospina]

Hi,

I have update the translation quick start guide in order to address the
following bugs:

* Bug 204266: 
Improvement of 3. Translating Software
* Bug 205167: 
Need to include info for New Language, which has no status page
* Bug 198726: 
Improvement of the section Table of Contents

I put a comment with the bug number before and after the edited texts in
the XML file.

I would appreciate if anyone could proofread and edit the changes.

Thanks,
Manuel Ospina