allow ResourceLoader modules to allow parsed messages (bug 43409)

construct footer link for languages completely in js
add MFResourceLoaderFileModule to allow processing of essential methods
before adding to JavaScript

change a message from html to wikitext (translators find wikitext easier
to deal with)

Change-Id: Idf5bde24a1e0e512fa9897190fed0b1e329f256d
Merge "allow ResourceLoader modules to allow parsed messages (bug 43409)"