Should I internationalize references to strings in external resources?

In a plugin I wrote, I document some recommended settings for using Font Squirrel’s Webfont Generator. Currently, I’ve internationalized the strings, e.g., __( 'X-height Matching', 'text-domain' ), where X-height Matching is actually a string found in the Generator.

The Webfont Generator is only in English so retrospectively I think it would be better to leave these strings untranslated since it could cause user confusion.

Seeking advice, especially from the translator community.

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