Pull Request for Issue #9525

Original issue description

Steps to reproduce the issue

Upgrade from Joomla 3.4.8 to Joomla 3.5 on a very long living site.

Expected result

The title of admin menu item with title "com_contact" is renamed to "com_contact_contacts".

Actual result

The title of a menu item which is used on the frontend (title = 'Geschiedenis') is renamed to "com_contact_contacts". That means the main menu on my site now contains a item with title "com_contact_contacts".
System information (as much as possible)

- Upgrade from 3.4.8 to 3.5
- Long living installation, migrations and upgrades since Joomla 1.5
- Using MySQL database
- The IDs of the backend menu items (client_id = 1) are not equal to the ones in a clean Joomla installation.

Additional comments

Issue is caused by #8212 which uses a hardcoded menu item ID (8) to update the menu item title. Menu item ID 8 may be used for another than the meant one.
Fix proposal

I think other people with (somehow) non-default menu item IDs may/will have the same problem. My proposal is to only change the title for menu items which matches the follow criteria:
a) only backend menu items (client_id = 1)
b) with title = 'com_contact'
c) in a submenu (level = 2)

For MySQL the following query does the job from phpMyAdmin:
UPDATE jml_menu SET title = 'com_contact_contacts' WHERE client_id = 1 AND level = 2 AND title = 'com_contact'

If you agree I wil be happy to change the queries and submit another PR. I also can help testing for MySQL because I did not upgrade my production installation yet.