they dont see the error, but it gets logged

Missing Translation For CP_PM.PMLIMIT_ALL

Just add this to the language you are using or run the tool which is provided in source to SYNC language files:

Under PMESSAGE page add this:

<Resource tag="PMLIMIT_ALL">
        You have {0} private messages: {1} in Inbox and {2} in Outbox, {3} In Archive from total {4} allowed. Your mail is box filled on {5}%.
    </Resource>

<Resource tag="MODERATION">Moderation</Resource>

You can download the tool via source code at SVN here .It is located in the Tool folder.Keep in mind that this source are for testing purposes and not for production environment.Always use the one that is published officially here by Jaben.

  <page name="PROFILE">
    <Resource tag="MODERATION">Moderation</Resource>

but i still get the error in the event log