Removed unused strings in Packages - fix #1688

Signed-off-by: emanuele <emanuele45@gmail.com>
Another bunch of unused strings in ManageThemes plus a forgotten setting - fixes #1686

Signed-off-by: emanuele <emanuele45@gmail.com>
Use credits_remove during unisntall of addons

Signed-off-by: emanuele <emanuele45@gmail.com>
Merge pull request #1833 from emanuele45/strings

Strings