I usually create one localization script for each language for the plugin. The script contains variables with all the lines that the plugin uses. Other scripts allow you to define all text strings in the plugin parameters.
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:
<script type="text/javascript" src="/Scripts/jquery.yourplugin.resources.<%= userLanguage %>.js"></script>
<script type="text/javascript" src="/Scripts/jquery.yourplugin.js"></script>