There is no german in the Oppo Find 7a version. I can choose it, but the UI remains english. The second problem is, that "double tap to wake" is not working.
With the appended theme you will get a transparent statusbar using third party launcher like Apex, Nova and so on ...
1. Import the theme from SD Card into the Theme Manager.
2. Goto "mixing" and select this theme for the statusbar.
3. In the developer settings disable "show rounded corner"...