Merge branch 'otr'

Conflicts:
	CHANGES.rst
	locale/af/LC_MESSAGES/af.js
	locale/af/LC_MESSAGES/converse.json
	locale/af/LC_MESSAGES/converse.po
	locale/converse.pot
	locale/de/LC_MESSAGES/converse.po
	locale/en/LC_MESSAGES/converse.po
	locale/es/LC_MESSAGES/converse.po
	locale/fr/LC_MESSAGES/converse.po
	locale/it/LC_MESSAGES/converse.po
	locale/pt_BR/LC_MESSAGES/converse.po