[FIX] web: rendering issue in mail composer on Firefox

The cleditor width does not include the margins. Setting 100% will make the editable area too large (104%) on Firefox (opw 611700).
Replaced by auto, the default value adviced by CLEditor.
[FIX] purchase: purchase buttons on product form only for purchase users
[FIX] mail: bad test
[IMP] hr: strenghtening of write()
Merge pull request #1790 from thanhchatvn/patch-2

Update vi.po
Merge pull request #1800 from blaggacao/8.0-l10n_co

8.0-l10n_co
[FIX] web: ignored readonly attribute on image widget
[FIX] mail: tell orm to rename column "read" to "is_read"
[FIX] bundles: fix compiled css assets recomposition

- Do not include css in less source because malformed css will break
  less compilation
- Always recompose compiled css, even if not in debug mode
- Less and sass compilers mode @at-rules on top in order to comply
  to css 2.1, those @at-rules where left-over during the recompostion
  because they lost their marker. Those are now handled as virtual
  inline stylesheets.
[FIX] HTML Questions
[FIX] HTML Questions
[FIX] website: correct unslugify of routes
[FIX] base: show "application" in view view
[FIX] point_of_sale: the receipt would not print correctly on first try
[FIX] ir.attachments of compiled css assets not properly invalidated
[FIX] account_anglo_saxon: variable 'standard_price' referenced before assignment

Due to forward-port, the variable standard_price was reintroduced instead of valuation_price_unit
Move the change of currency after the fifo/lifo computation.
Fixes #1801
[FIX] HTML row
[IMP] auth_oauth: set default 'zocial' css_class

The buttons for new providers needs at least the zocial css class to be seen as button. As the field css_class is not in the default form view, add it by default.
[FIX] point_of_sale: prevent changing the customer after printing the receipt
[FIX] project_issue: project issue user must be able to read resource calendar

In order to be able to read the days_since_creation field