Typo fix and error message tweak

Author: rsa33

control/templates/shared/add_vhost_test.html

@@ -54,7 +54,7 @@ <h2>Test custom domain</h2>
     <input type="hidden" name="confirm" value="on">
     {% if valid[domain] == (true, true) or valid[prefixed] == (true, true) %}
         <input type="submit" class="btn btn-outline-primary" value="Looks good, add domain">
-    {% elif valid[domain] != (none, none) or valid[domain] != (none, none) %}
+    {% elif valid[domain] != (none, none) or valid[prefixed] != (none, none) %}
         <input type="submit" class="btn btn-outline-danger" value="Add domain anyway">
     {% endif %}
 </form>

control/webapp/utils.py

@@ -96,7 +96,7 @@ def validate_domain_docroot(owner, path):
     if not path:
         return path, None
     if any(ch in path for ch in string.whitespace + "\\" + '"' + "'"):
-        return path, "Document roots cannot contain spaces or quotes."
+        return path, "Document roots cannot contain spaces, backslashes or quotes."
     if path.startswith("public_html/"):
         path = path.replace("public_html/", "", 1)
     if isinstance(owner, Member):