Updated mediawiki/extensions
Project: mediawiki/extensions/Flow  19e07924547ef7b747b2129468df451dbf289c16

i18n: get rid of hardcoded 'x comments' text

Also getting rid of flow-topic-comment-count key, which is equivalent to
flow-topic-comments (which is the oldest)

Change-Id: I03319801b03fd23d489eeb79efb0511649daabad