Add 'Help contents' in different languages

[cdavila]

Currently the only language available when you press F1 is English, but it would be nice having this help translated in other languages. Same occurs for 'Installation and User Guide'. I propose following TODO list to solve this:
TODO
*Add index_xx.html and userguide_xx.pdf files for other languages into /qgis/doc/.
*Add each language flag icon on top of index.html linked to corresponding index_xx.html file.
*Link 'Installation guide' and 'User guide' at the bottom of index.html to corresponding userguide_xx.pdf files.

As a first step, I attach file /qgis/doc/index_es.html translated into Spanish (links to userguide_es.pdf need to be updated).

[cdavila]

index.html (Help contents) translation into Spanish

[cdavila]

Fixes bug #879 for Spanish

[cdavila]

Attached bug879fix.diff includes:

• Modified index.html including links to en, de, es and pt index_xx.html. Thess are the languages currently existing in qgis_documentation/branches/0.9.1 (Sorry, I've just realized I didn't include Italian, but it can be added later). Other languages can be added as needed.
  
• index_es.html which links to userguide point to userguide_es.pdf
  
• Flag images for mentioned locales.
  
  

Things that still need to be done:

• Calling translators to translate/update index.html into index_xx.html after it has been updated with next release new features/bugfixes.
  
• Adding userguide_xx.pdf from qgis_documentation/branches/0.9.2 just before next release.
  

Note: I think these two things could be added to ReleaseChecklist0.9.2

[cdavila]

Added patch bug879fix2.diff that makes new files in /doc and /doc/images be installed.

[pcav]

It works, at least in Italian. Please reopen it if it doesn't in other languages

[(none)]

Milestone Version 1.0.1 deleted

[pcav]

I confirm, it does not work in other languages than English. Care should be taken to keep the index pages upadted, though.