Hi elliot,
First of all, I believe your plugin is great. It really helps me a lot developing my themes.
Unfortunately, when I have to use more than one language I use WPML plugin and sometimes there are some conficts between your plugin and WPML.
In these cases, I use Types plugin, that is fully compatible with WPML, but in my opinion, it isn´t as good as your plugin.
My request it is to make ACF fully compatible with WPML, although I understand it might be diifficult or it might take hard work.
Thanks for your plugin,
Victor
