Over the past week or so, I've found the review bot[1] created by Merlijn extremely helpful. It automatically adds me as reviewer to all patch sets that make changes to a file with "i18n" or "Messages" in the path. I try to review within 12 hours, but as I need to sleep, spend time with the family, eat and work on other stuff also, that sometimes doesn't happen. I'm also subscribed to the mailing list mediawiki-commits, which is a stream for *all* changes that come through Gerrit. Very high volume (200-400 e-mails a day), but very useful for the type of work I do. Hard to keep up with, too.
Reviewer bot has malfunctioned a few times over the past few days. In those cases I was not added as a reviewer. Apologies if I failed to review your patch set. If you want to ensure that I have a look at it, please add "siebrand" to the reviewers of your patch set. Sometimes I'm able to also review patch sets other than i18n/L10n related, but because if a high workload, I sometimes decline requests for review that are outside of my direct scope. I hope you understand.
Other users that can review your i18n related patch sets are Amir Aharoni, Niklas Laxström and Santhosh Thottingal. Feel free to send me a mail if you think your patch set should have gotten an i18n review already, but didn't.
Rock on!
[1] http://www.mediawiki.org/wiki/Git/Reviewers