That warning links to the instructions for internationalization, which I
have tried to follow. Most of the key output strings are encoded with __()
or _e(). I've created a POT file, and a few translations have been produced
by users of the plugin. I fixed one issue with the header, where the
"domain path" for the translation files wasn't specified, but I'm still
getting the same message.
> Code for stable (rsvpmaker/tags/3.7.9/ <https://plugins.svn.wordpress.org/rsvpmaker/tags/3.7.9/>) in process...
> This plugin has a wrong text domain declaration in the file header:
> ./rsvpmaker.php:Text Domain: rsvptoast
> This plugin doesn't use load_plugin_textdomain().
> Code for stable was processed.
> Readme for stable (rsvpmaker/tags/3.7.9/ <https://plugins.svn.wordpress.org/rsvpmaker/tags/3.7.9/>) in process...
> The GlotPress projects were updated.
> Result of the POT import: 0 new strings added, 0 updated, 0 fuzzied, and 0 obsoleted.
> Readme for stable was processed.
You can find the errors for you plugin on that slack channel. I think this has been documented somewhere (a post on the make blog, I think), but maybe it isn't mentioned in the handbook.