Allow 1 letter usernames

templates/user/signup.tmpl

@@ -7,7 +7,7 @@
 		<div class="form-group {{if .Err_UserName}}has-error has-feedback{{end}}">
 			<label class="col-md-4 control-label">Username: </label>
 			<div class="col-md-6">
-				<input name="username" class="form-control" placeholder="Type your username" value="{{.username}}" required="required" title="Username must contain at least 5 characters">
+				<input name="username" class="form-control" placeholder="Type your username" value="{{.username}}" required="required">
 			</div>
 		</div>