* banner: add banner and localization improvements from ukwa branch:
- show 'view all captures' link if not live
- optional logo
- loc options, if available
- banner options set via window.banner_info in banner.html
localization support:
- add init_loc() to templateview
- loc available if config options set
- tests: add tests for loading localized messages, override .gitignore to allow test messages.mo
