Currently translated at 97.5% (276 of 283 strings)

Translation: Converse.js/Translations
Translate-URL: https://hosted.weblate.org/projects/conversejs/translations/nb/

- Don't close the emojis panel after inserting an emoji.
- Focus the message textarea when the emojis panel is opened or closed.

- Also, use a virtual-dom view for rendering the roster filter.

For the MUCJoinView and the LoginPanel

This came out of the desire to let `converse-muc` use the API to
determine whether MUC is supported. However, we don't know the entity
JID before hand and I couldn't think of a good way to query all current
and future entities for a feature.

So `converse-muc` still does it's own thing without the API, but some
refactoring came as a result of attempting.

Let a promise be returned instead of a wrapper, but glue the `resolve`
and `reject` methods onto it

This removes the need for `switch (obj)` in the template which is not
allowed in strict mode.

Additionally using a named variable speeds up rendering.

- Update build scripts to use transpiled versions of newly added modules
- Stop building locales.js and remove locales stuff from build scripts
- No need for Grunt anymore since we don't need to make locales.js

to check whether a certain service discovery feature is supported by an entity.