Accept dashes and spaces in names

Change-Id: Ie3729175c1f739bb0be4402e9be1e2a1921da752
diff --git a/templates/strings.php b/templates/strings.php
index 2bf82f9..405e353 100644
--- a/templates/strings.php
+++ b/templates/strings.php
@@ -9,7 +9,7 @@
 
 $USERNAME_VALIDATION_ERROR = (object)[
         "registered" => "This username is already in use! Please choose another username<br>",
-        "no_whitespaces" => "Username cannot contain whitespaces<br>",
+        "no_whitespaces" => "Username cannot start with whitespaces<br>",
         "smaller_than" => "Username must have less than {{num}} characters<br>",
         "bigger_than" => "Username must be bigger than {{num}} characters<br>",
         "no_special_chars" => "The username cannot contain special characters<br>",