Remove capitalize-subtitle, restore sentence cases

Author: bwiernik

schemas/styles/csl.rnc

@@ -1000,16 +1000,16 @@ div {
         ## Capitalizes the first character (other characters remain in
         ## their original case).
         "capitalize-first"
-      | 
-        ## Capitalizes the first character and the first character of a subtitle
-        ## (other characters remain in their original case).
-        "capitalize-subtitle"
       | 
         ## Capitalizes the first character of every word (other characters
         ## remain in their original case).
         "capitalize-all"
       | 
         ## Renders text in title case.
         "title"
+      |
+        ## Renders text in sentence case.
+        ## Deprecated. Will be removed in CSL 1.1
+        "sentence"
     }?
 }