UX/UI Responsive – Long forms with multiple language content

I want to know the preferred (and why it is good/bad) way to show a long form with multiple sections, which have content that should be in multiple languages (if multiple language is supported)

The site is more or less like a web-based erp and it should be responsive to mobile version (at worst, 320px wide screen) and the forms can contain up to 15 form fields per section.

Currently, I used tab model for dividing the sections, which changes into a dropdown selection on small screens. However, I have doubts about the language stuff. There could be only 1 field with multiple language opt, but there also could be 7 in a section.

I'm thinking about having another tab section inside the section with multiple language content, which grouping the content with language support for easy editing/input. But this means that the form flow might not be as good as before (since there's a chance that [Item Title] located on the bottom part of the section instead of being at the top). Not to mention if there's only 1 field, the tab would be an overkill.

UPDATED: By multiple language, I meant more for content (anything that comes from user filling up the forms, ie. item description, item title).