Hey there,
Little update on the situation.
We've made some improvements on the matter of translation interface in epesi and you can expect to see these features in next release.
Translating each string doesn't require full processing, instead a JS prompt is shown and you type the transaction there. This way you don't even leave the page you're on, covering the issue no. 2. 🙂
There's also filter to show all/only translated/only not translated strings.
We hope to bring even more improvements to the translation mechanism in the future.
Kind regards,
Arek