This is a BEHAT_RUNNING only hack, so it doesn't affect normal
operations at all. What it achieves is to reduce the number of
strings loaded when customising a lang pack from current 31K ones
to the just needed ones for Behat testing purposes.
That way we avoid the random failures that are happening more and
more (while the "en" lang pack grows) and also save some precious
minutes in every behat run.
Also, unrelated, a couple of tiny changes:
- Modified constant (that was really outdated) to current number
of lang strings (so the progress bar behaves better).
- Remove an elseif occurrence because it was hurting my eyes.