Changes:
* b00217d: build: Remove unused 'pkg' property in Gruntfile
* 5404f66: Use String#slice instead of String#substr or String#substring
* b612e92: Fix \t masquerading as a space
* 07c3fae: Add capability to set attributes and raw HTML
Change-Id: I5352032a1cef9de9afdcc3717804c4957528dfd3
Instead of using the whole jquery.i18n code, use only required parts
that are not customized in MW ULS. For this define a new RL module
ext.uls.i18n.
Also refactor MW message store for jquery.i18n.
Change-Id: Idda9fe505428ade409d937314d7216ebb4232c36