Issue 336 (#380)

Co-authored-by: Dennis Ploeger <develop@dieploegers.de>
Co-authored-by: dploeger <dploeger@users.noreply.github.com>

docs/api/SayCommand.md

@@ -9,7 +9,14 @@
 `say object text [type] [avatar]`
 
 Runs the specified string as a dialog said by the object. Blocks execution
-until the dialog finishes playing. Optional parameters:
+until the dialog finishes playing.
+
+The text supports translation keys by prepending the key and separating
+it with a `:` from the text.
+
+Example: `say player ROOM1_PICTURE:"Picture's looking good."`
+
+Optional parameters:
 
 * "type" determines the type of dialog UI to use. Default value is "default"
 * "avatar" determines the avatar to use for the dialog. Default value is