Fixed non-breaking spaces.

[Lynuxen]

Description

remove_whitespace() collapsed non-breaking spaces into ordinary spaces, so   had no effect in the output document. Text that was deliberately kept on one line could be broken by Word, e.g. an amount written 19 000,00 € would wrap as "19" / "000,00 €" in a justified paragraph.

Checklist Before Requesting a Review

• [x ] I have performed a self-review of my code.
• [x ] My code follows the project's coding style and guidelines.
• [x ] I have run tests and verified that all existing and new tests pass.
• [x ] I have added new tests to cover my changes.

[dfop02]

LGTM. I'll release a new version until the end of week, thanks for the support!