Fix Org edit page bugs: renaming detection, maxlength (#24161)

## Before

* The renaming detection is wrong (eg: pasting a new name into the input
doesn't trigger the detection)
* The renaming prompt layout is not good
* Some MaxSize/maxlength rules is missing


![image](https://user-images.githubusercontent.com/2114189/232379191-5d0f6d10-56ca-4cec-ac52-7f77b9cb4a8a.png)


![image](https://user-images.githubusercontent.com/2114189/232379234-3289373b-9ddb-4627-ae86-f4d74589fa0c.png)

## After

* Fix these problems


![image](https://user-images.githubusercontent.com/2114189/232379098-31c6fa21-c210-4e7f-a337-b38b99670835.png)

templates/org/create.tmpl

@@ -11,7 +11,7 @@
 					{{template "base/alert" .}}
 					<div class="inline required field {{if .Err_OrgName}}error{{end}}">
 						<label for="org_name">{{.locale.Tr "org.org_name_holder"}}</label>
-						<input id="org_name" name="org_name" value="{{.org_name}}" autofocus required>
+						<input id="org_name" name="org_name" value="{{.org_name}}" autofocus required maxlength="40">
 						<span class="help">{{.locale.Tr "org.org_name_helper"}}</span>
 					</div>