i18n: Remove period from more messages

The period is after $2 of antispoof-name-illegal
where this message are shown.

Follow-Up: Ie88841009610804bd17357323155af9de237ef9b
Change-Id: I300a25a3295dca8b28b0b313a8461c1eaac5547e
(cherry picked from commit c9d4d2aabb)

i18n/en.json

@@ -15,15 +15,15 @@
 	"antispoof-name-illegal": "To prevent confusion, the username \"$1\" cannot be used: $2.\nPlease choose another username.",
 	"antispoof-bad-char": "$1 ($2)",
 	"antispoof-bad-char-non-printable": "$1",
-	"antispoof-badtype": "The provided username is an invalid type.",
-	"antispoof-empty": "No username was provided.",
+	"antispoof-badtype": "The provided username is an invalid type",
+	"antispoof-empty": "No username was provided",
 	"antispoof-prohibited": "Usernames cannot contain the character \"$1\" because it is prohibited",
 	"antispoof-combining": "Usernames cannot contain the combining character \"$1\"",
 	"antispoof-unassigned": "Usernames cannot contain the character \"$1\" because it is an unknown character",
 	"antispoof-deprecated": "Usernames cannot contain the character \"$1\" because it is deprecated",
-	"antispoof-noletters": "Usernames must contain one or more characters.",
-	"antispoof-mixedscripts": "Usernames cannot contain characters from different writing systems.",
-	"antispoof-tooshort": "Your provided username is too short.",
+	"antispoof-noletters": "Usernames must contain one or more characters",
+	"antispoof-mixedscripts": "Usernames cannot contain characters from different writing systems",
+	"antispoof-tooshort": "Your provided username is too short",
 	"antispoof-ignore": "Ignore spoofing checks",
 	"antispoof-ignore-help": "Allows users with sufficient privileges to create an account even if its name is similar to that of an existing account.",
 	"action-override-antispoof": "override the spoofing checks",