Fixes #5354 broken export to PDF with links.

aperiterorequested to merge
aperitero/inkscape:issue-5354-pdf-links-export into 1.4.x

Export to PDF with Cairo 1.16 and some locales didn't work because of a bug in Cairo (expecting localized decimal separator in links' "rect" attribute).

Additionally to prevent future issues with Cairo tag's attributes, the "classic" locale is now used when formatting number.

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