GFL shorthand utility alias

BUR #56992 has been approved by @Hillside_Moose.

create alias gfl -> girls'_frontline
create alias gfl2 -> girls'_frontline_2:_exilium

Like all of snowpiercer's recent BURs, this one, BUR #56963, got manually rejected because it didn't explain anything. But I think there's some use to this one, hence why I'm seperating it out.

If you were to use the /abbreviation feature, GFL and GFL2 are currently /gf and /gf2e, but the GF shorthand is moreso used outside of English, particularly in Chinese circles. GFL is the more common shorthand in English because, well, GF is normally girlfriend. The official account on Twitter for GFL2 (Darkwinter) was actually briefly GF2EXILIUM_EN near launch (you can still find remnants of this on Google) before getting changed to GFL2EXILIUM_EN, so there's official precedent on this too, even if GF has also been used officially.

If we were to somehow argue that GFL or GFL2 is still ambiguous, which it really shouldn't be, we can always qualify it with something like in topic #33696.

The bulk update request #56992 (forum #426109) has been approved by @Hillside_Moose.

While this has already been accepted, if you want to add to the list of precedents, in the future you can also link topic #28534, so that gives you three topics worth of aliasing an abbreviation because it's either the common title, for search utility where slash abbreviations don't work or resolution if the abbreviation may conflict with a different tag.