document password character limitation

fixes #407

CHANGELOG.md

@@ -3,7 +3,14 @@ CHANGELOG
 
 In Development
 --------------
- * Update to Roundcube 1.3.8.
+
+Setup:
+
+* Update to Roundcube 1.3.8.
+
+Control Panel:
+
+* The users page now documents that passwords should only have ASCII characters to prevent character encoding mismaches between clients and the server.
 
 v0.29 (October 25, 2018)
 ------------------------

management/templates/users.html

@@ -31,7 +31,7 @@
   <button type="submit" class="btn btn-primary">Add User</button>
 </form>
 <ul style="margin-top: 1em; padding-left: 1.5em; font-size: 90%;">
-  <li>Passwords must be at least eight characters and may not contain spaces. For best results, <a href="#" onclick="return generate_random_password()">generate a random password</a>.</li>
+  <li>Passwords must be at least eight characters consisting of English lettters and numbers only. For best results, <a href="#" onclick="return generate_random_password()">generate a random password</a>.</li>
   <li>Use <a href="#" onclick="return show_panel('aliases')">aliases</a> to create email addresses that forward to existing accounts.</li>
   <li>Administrators get access to this control panel.</li>
   <li>User accounts cannot contain any international (non-ASCII) characters, but <a href="#" onclick="return show_panel('aliases');">aliases</a> can.</li>