Add error message "password is too short"

src/server/form/invited.js

@@ -5,5 +5,5 @@ const field = form.field;
 module.exports = form(
   field('invitedForm.username').required().is(/^[\da-zA-Z\-_.]+$/),
   field('invitedForm.name').required(),
-  field('invitedForm.password').required().is(/^[\x20-\x7F]{6,}$/),
+  field('invitedForm.password').required().is(/^[\x20-\x7F]*$/).minLength(6),
 );

src/server/form/register.js

@@ -6,6 +6,6 @@ module.exports = form(
   field('registerForm.username').required().is(/^[\da-zA-Z\-_.]+$/),
   field('registerForm.name').required(),
   field('registerForm.email').required(),
-  field('registerForm.password').required().is(/^[\x20-\x7F]{6,}$/),
+  field('registerForm.password').required().is(/^[\x20-\x7F]*$/).minLength(6),
   field('registerForm[app:globalLang]'),
 );