Add SFW content mode option (#6262)

* Use more neutral language for content
* Add sfw mode setting
* Make configuration context mandatory
* Add sfw class when sfw mode active
* Hide nsfw performer fields in sfw mode
* Hide nsfw sort options
* Hide nsfw filter/sort options in sfw mode
* Replace o-count with like counter in sfw mode
* Use sfw label for o-counter filter in sfw mode
* Use likes instead of o-count in sfw mode in other places
* Rename sfw mode to sfw content mode
* Use sfw image for default performers in sfw mode
* Document SFW content mode
* Add SFW mode setting to setup
* Clarify README
* Change wording of sfw mode description
* Handle configuration loading error correctly
* Hide age in performer cards

ui/v2.5/src/docs/en/Manual/Interface.md

@@ -4,6 +4,15 @@
 
 Setting the language affects the formatting of numbers and dates.
 
+## SFW Content Mode
+
+SFW Content Mode is used to indicate that the content being managed is _not_ adult content. 
+
+When SFW Content Mode is enabled, the following changes are made to the UI:
+- default performer images are changed to less adult-oriented images
+- certain adult-specific metadata fields are hidden (e.g. performer genital fields)
+- `O`-Counter is replaced with `Like`-counter
+
 ## Scene/Marker Wall Preview Type
 
 The Scene Wall and Marker pages display scene preview videos (mp4) by default. This can be changed to animated image (webp) or static image.