Don't translate examples of platform messages

This refers to text in the "Sending your work" section of developer_guide.md, but most of these languages are still using contributing.md.

Since the project communicates in English, examples of commit titles and references in commit messages should be left in English. Overview:

• Translation of these examples reverted to English in the Italian and Spanish documents.
• The Danish text used examples in English, but accidentally copied or between two examples. Replaced by eller, one of the two Danish words I know, thanks to Søren Kierkegaard.
• Edit: I also used 'or' in the Italian text, corrected in the second commit.
• The French text used examples in English, but there was an unrelated typo in this section in the heading "Soyez courtois ave le git-log".

Paging @erciccione for Italian and translation issues.