[WIP] i18n: Core UI translations

[natacha-beck]

Description

Introduces the first major phase of internationalization (i18n) for the CBRAIN platform. Goal support :en and :fr

Scope of current changes

• layouts/: Application skeleton.
• shared/: Reusable components.
• portal/: Main dashboard.
• userfiles/ userfiles views
• access_profiles/ views to pre-defined profiles
• sessions/ sessions views (login page)
• groups/ also know as projects views
• sites/ sites views
• invitations/ to send invitations
• tasks/ generic tasks views
• users/ users views
• bourreaux/ bourreaux views
• help_documents/ to add documentation
• models/: Added en and fr YAML dictionaries for ActiveRecord model names and attributes.

Next views to do:

• background_activities/
• cbrain_mailer/
• custom_filters/
• data_providers/
• exception_logs/
• messages/
• noc/
• quotas/
• resource_usage/
• signups/
• tool_configs/
• tools/

....