How to change Icons:
1.
Open MWS and open local-deDE.mpq/expansion-locale-deDE.mpq (or local-enGB.mpq/ expansion-locale-enGB.mpq what ever)
2.
Now click on Interface and on Icons.
3.
Then find the Icon that u want to change and cope the name into your Notepad.
4.
Now find the Icon that u want to have. Make a know folder in C:\Program Files\World of Warcraft\Data\ called "Interface" and in the new folder a folder called "Icons". Extract the file in "Icons".
5.
Go to the "Icons" folder and rename the file.
For example:
Ability_Warrior_ImprovedDisciplines -> Ability_Druid_CatForm
6.
Now go back to MWS and select Create MPQ archive under Pack.
7.
Create a file called "patch-5" (or patch-2 - 7)
8.
Click on Pack and choose Add File to MPQ Archive.
9.
U should see this, and click on the ... and open your Icon.
Click on the arrow and click on that under the Icon.
Before
After
Click on OK.
10. Now click on Save.
Grats