TODO: translate some untranslated strings

Only subscription are supported (no single calls)

"root" provider handle all events (and cancel propagation)

(update attribute only if value changed)

Set init key/values like an other attributes: key="value"

When added in HTML a mutation observer does not recognize them...

(only a prove of concept)

Implement "set-property" handling in dbp-provider and use it in dbp-language-select (dbp/apps/library#77)

See issue #31

See issue #31

See issue #31

See issue #31

See issue #31

See issue #31