You can follow bugs that require web localization work on Bugzilla by monitoring bugs where the web@localization.bugs address is in the CC field.
For all locales that we currently support, there is a central place to follow per locale bugs filed in bugzilla, the Web Localization Dashboard : http://l10n.mozilla.org/webdashboard/
For example, here is the list of open web localization bugs for Korean:
http://l10n.mozilla.org/webdashboard/?locale=ko
These pages have RSS feeds you can subscribe to, to be directly informed of major web localization bugs requiring help.