[FIX] web: force company_logo change on company change

In multi company environment, the company logo was not updated on company change in the user preferences
This disrupted the end user, as he might think the company change did not happen.
[FIX] web_graph: pass context to fields_get for translation

In graph views, fields from the pivot table were not translated in the user language
We pass the context, containing the user language, to fields_get in order to get the translation
This is also done by the search view, in search.js line 1978 at this rev.

opw-616713
[CHG] ws doc: set right section against a dark background
[FIX] doc: viewport meta missing
[IMP] ws doc: affix language switcher to page top
Merge pull request #4 from odoo/8.0

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