[IMP] *: remove "French spacing" 👺

According to Wiktionary, French spacing is "the archaic practice (though
still current in French) of inserting a space around colons, semicolons,
question marks, and exclamation marks". This is not standard practice in
English and most languages of the world.

The purpose of this commit is to start purging the code from this typo,
as it may reflect poorly on the software for some people.

closes odoo/odoo#114533

Related: odoo/enterprise#37853
Signed-off-by: Sébastien Theys (seb) <seb@odoo.com>

addons/utm/models/utm_tag.py

@@ -22,5 +22,5 @@ class UtmTag(models.Model):
         help='Tag color. No color means no display in kanban to distinguish internal tags from public categorization tags.')
 
     _sql_constraints = [
-        ('name_uniq', 'unique (name)', "Tag name already exists !"),
+        ('name_uniq', 'unique (name)', "Tag name already exists!"),
     ]