I'm submitting a feature request

Currently we have to provide the TRANSLATIONS_FORMAT at bootstrap time. I would expect Angular to identify the format by itself, since the format is passed via the file itself (for example xlf: <xliff version="1.2" xmlns="urn:oasis:names:tc:xliff:document:1.2">). I think that this is not needed and redundant, which is also my motivation for opening this issue.

By the way: Even the LOCALE_ID could be read from at least the xlf file (not sure what it looks like in xmb files). If it is not explicitely set, it could be read from the xlf file as default behaviour (from the <file> property target-language)