Everyone loves a ligature, but within our codebase we should
be consistent, and sadly that means using en-US, not en-GB-archaic.
Also having non-basic latin characters in filenames is a bit
of a pain for developers.
Similarly for the i18n message, the ligature should go in
MessagesEn_gb if anywhere.
Also in this commit, re-saved the BF thumbnails as plain SVG.
Change-Id: I21a2bf040bed132d3f1c73c916c731d36e0ad852
Make every module that was formerly part of the experimental module its own
Beta Feature. For now, all of them are commented out except for formulæ editing
(mwmath). The "experimental" Beta Feature bucket is no more, but the preference
remains so that it can be set to both true and hidden on MediaWiki.org to let
all the different experimental flags.
The feature icons, previous mis-named "logo" and mis-identified as "screenshots"
are now renamed. One for the mwmath Beta Feature has been added (the rest need
creating before those can be enabled). The i18n descriptions now each identify
that the feature is an experimental one, and that caution is needed.
Change-Id: I28862f3e62f5c78aca33f11265aced1db67f4725
