If I export a language using the locale module's export option at admin/settings/locale/language/export, I am unable to import the translation file in other drupal sites (running on the same platform - it's a multisite deployment).
The import process stops whenever it finds a msgid_plural entry.
If I remove such entries, the import process executes successfully.
In my latest attempt, I had to remove the following entries in order to get it to work:
#: modules/comment/comment.module:304;436 modules/node/node.module:68
msgid "1 comment"
msgid_plural "@count comments"
#: modules/forum/forum.module:975;1010 modules/tracker/tracker.module:104
msgid "1 new"
msgid_plural "@count new"
#: modules/throttle/throttle.module:110 modules/user/user.module:589;592
msgid "1 user"
msgid_plural "@count users"
#: modules/aggregator/aggregator.module:986;997;1406
msgid "1 item"
msgid_plural "@count items"
#: modules/archive.module:173
msgid "1 post"
msgid_plural "%count posts"
#: modules/comment/comment.module:314
msgid "1 new comment"
msgid_plural "@count new comments"
#: includes/common.inc:993
msgid "1 byte"
msgid_plural "@count bytes"
#: includes/common.inc:0
msgid "1 year"
msgid_plural "@count years"
#: includes/common.inc:0
msgid "1 week"
msgid_plural "@count weeks"
#: includes/common.inc:0
msgid "1 day"