use proper load event when loading new angular-locale
allow for html templates as params to i18n

allow params to be parsed as templates now so we exclude inlined html
from the message strings, e.g:

_('Welcome to {link: Telegram}', {link: '<a href="https://telegram.org/">{0}</a>'});
=> Welcome to <a href="https://telegram.org/">Telegram</a>

see discussion at https://github.com/zhukov/webogram/pull/452
start counting from 0 in i18n messages now

the previous commit changed this
removed html links from i18n messages