Closes #295
New translation strings
Check that ValueMax is >= 1
Show details if error in advanced settings
Correctly show error message for ValueMax
Make email field an email one
Make username, email (if smtp of course) and title required html inputs

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

Correcting comment typo in file header

Fix #190 

See merge request !144

    - Ajout d'un editeur de markdown
    - On garde le formattage des espaces
    - On empeche l'utilisateur de mettre du html

	- Just found that the "hidden" parameter wasn't...

	- Just found that the "hidden" parameter wasn't...

	- As it is now, description can't be in error state : we are waiting the markdown implementation to eventually change that.
	- Comments are now normaly formated (newlines are taken into account)
	- The title, description and comment regexes are now useless. Deleted.