wrong text domain in newsletters lite?
At least this free lite version of the plugin makes some problems if you would like to translate the plugin. It seems for me, the wrong text domain in the __(...) functions is used. According to
"The text domain is a unique identifier, which makes sure WordPress can distinguish between all loaded translations. If your plugin is a single file called my-plugin.php or it is contained in a folder called my-plugin the domain name should be my-plugin. The text domain name must use dashes and not underscores."
Newsletters lite plugin defines "wp-mailinglist" as text domain, while the folder is newsletters-lite.