TLDR; The StockPack plugin is fully translatable with WPML, use the Media Translation Extension to translate images caption and alt text.
WPML is a plugin that allows you to run a multilanguage WordPress website. Stockpack has been tested for compatibility with WPML and everything is translatable.
Since Stockpack is not a frontend plugin, all the text from settings and messages can be translated via GetText. The only part of the plugin that shows up on the frontend is the images.
The images are standard Media Attachments, and they are detached from the plugin to ensure maximum compatibility. Due to that, you need to install the Media Extension Translation and you can easily translate images caption and alt text.
If you have any questions, or this isn’t working for you, please contact support.