Add comments to source text to allow several different translations for the same source text (difference is made thanks to the source text comment)
This CR is marked as not requiring translations
Handle comments in source texts correctly
Bug fix
Bug fix while explaining expectation : Condition was not always taken into account
Emit warning messages when
 - a step that requires a translation does not have a matching translation
 - a translation is empty (no action, no expectation) and is not related to a requirement and has no comments
Emit warning messages when
 - a step that requires a translation does not have a matching translation
 - a translation is empty (no action, no expectation) and is not related to a requirement and has no comments
Allow to drag & drop from the variable editor view
Changed message fields types from int to string
Fixed bug in the translation of imported packets