Hi!

Thanks for taking the time to check it out and the feedback!

For the theming feature, I was thinking of adding a way to export the installed themes, that way the user can download the theme being used and apply any customization and re-upload as a new custom theme.

A blank template for new designs is an excellent idea.

I've also created a small node based command-line program that syncs local development changes to the live knowledge base portals. This helps a lot with testing and previewing the themes. I've not released it just yet, I plan to do so with an MIT license on GitHub. It is similar to Shopify's Themekit (https://shopify.github.io/themekit). This is what I use to work on theme designs.

For knowledgebase language strings, you are right, that's possible at the moment through the theme locale files.