add image to translation doc
add other options to translation docs
Merge pull request #1243 from garnertb/master

Fixes #1242.
Added the documentation for the MODIFY_TOPICCATEGORY setting, and reorganized some of the settings in a "Metadata Settings" section.
add instructions on geonode project
modified setup
old setup
added toctree
modify translation docs
added translation
modified
modified
modified po files - no translation added
modified po files - no translation added
modified po files - no translation added
Merge branch 'master' of https://github.com/GeoNode/geonode
Added on_delete=models.SET_NULL to thumbnails to prevent them from deleting layers, thanks Fuyou on #django
Merge branch 'master' of github.com:GeoNode/geonode
Now categories, keywords and date filters in layers, maps and docs page are collapsed by default. Thanks @ppasq!
Merge branch 'master' of github.com:GeoNode/geonode