With regard to spaces, French punctuation behaves like English, except in the case of the so-called "double" punctuation marks (;:!?). These should be preceded by U+202F, the "narrow no-break space". In the case of the Iglesias text, regular spaces were used, whcih meant that punctuation marks sometimes wrapped to the next line. I've now fixed that, and confirmed that XEP handles it OK.

Lots more to do on the Iglesias, though...