Fix regression from 0fc63bde365: unbreak number formatting in short timestamps
Fix regression from 0fc63bde365: unbreak number formatting in short timestamps

We were using momentjs here before (causing bug T123845),
but we switched to using a hack for short timestamps.
This hack didn't call convertNumber(), so we stopped performing
number formatting for languages that don't use Western Arabic
numerals (0-9).

Strictly, that regression "fixed" T123845 because it caused
0-9 to be used in all cases, including the case that that bug
asked for. This patch fixes the regression but preserves the
desired behavior for arwiki, since convertNumber() respects
$wgTranslateNumerals.

Bug: T123845
Change-Id: Ic9acb12f534e0f049e22577afe276f8bf68f691d

wikimedia/mediawiki-extensions-Echo,wikimedia/mediawiki-extensions-Echo,wikimedia/mediawiki-extensions-Echo,wikimedia/mediawiki-extensions-Echo