[Q] Can't write to system/app in Slimkat topic

Hello people,
I have a moto G XT1032 and I've been using slimkat for about 2 weeks, everything working perfectly, till one day I flashed something wrong and I soft-briked my phone. After fixing it and fresh-installing again slimkat, Titanium Backup doesn't uninstall system apps and I cannot install system apps either - with Root Explorer mount /system/app to R/W, paste the .apk and change permissions, reboot - the app is still not in the app drawer and I can't see in my installed apps, but it is in the /system/app folder with the right permissions.
I've searched a lot about this and I found posts recommending mounting system with some adb commands, but I've been uninstalling/installing system apps since I have android and I never had to do anything like that.

Am I doing anything wrong? Any possible solution without doing a full wipe?

Thanks in advance

[Q] Accidentally deleted Huawei Themes App from system/app topic

Hi everyone,
After I rooted my phone, I deleted apps from system/apps without knowing the consequences. I deleted the huawei themes app (presumably Themes.apk maybe).

I was wondering if anybody could post or pm the relevant extracted apk and odex file.

Thanks in advance!