CONTRIB-4154

Signed-off-by: Joseph Rézeau <moodle@rezeau.org>
CONTRIB-4128 :: SVG icon thanks to Albert Bachiller

Signed-off-by: Joseph Rézeau <moodle@rezeau.org>
CONTRIB-4185 :: Display emoticons in thankbody and addinfo texts

Signed-off-by: Joseph Rézeau <moodle@rezeau.org>
CONTRIB-4140 :: Use theme functions for images to allow theme overrides

Signed-off-by: Joseph Rézeau <moodle@rezeau.org>
CONTRIB-4178 :: Prevent respondents from leaving a questionnaire page without submitting/saving.

Signed-off-by: Joseph Rézeau <moodle@rezeau.org>