correct english of snippet_missing_title
[3.0] Add Italian translation
Merge pull request #365 from bendavies/i18-english

correct english of snippet_missing_title
Merge pull request #366 from dlondero/patch-1

[3.0] Add Italian translation
French translation
Merge pull request #370 from tgalopin/3.0

[3.0] French translation
Reformatted a bit the i18n file and reordered locales
Portuguese translations
changed tem to contem
Merged pr #373