* add Yin Yang Theme
* change download badge color to yin yang as well
* update string
* fix &
(cherry picked from commit d9ea621e544981062c2a67b8f4bb196cb0da904f)
# Conflicts:
# app/src/main/java/eu/kanade/tachiyomi/data/preference/PreferenceValues.kt
# app/src/main/java/eu/kanade/tachiyomi/ui/base/activity/BaseThemedActivity.kt