input: Remove translated-title (#341)

If we indeed plan to add support for this in the new 1.1 title object, 
we should not add translated-title in 1.0.2. So this PR removes these 
variables again.

Author: denismaier

schemas/input/csl-data.json

@@ -423,12 +423,6 @@
       "title-short": {
         "type": "string"
       },
-      "translated-title": {
-        "type": "string"
-      },
-      "translated-title-short": {
-        "type": "string"
-      },
       "URL": {
         "type": "string"
       },

schemas/styles/csl-variables.rnc

@@ -79,7 +79,6 @@ div {
     | "part-title"
     | "reviewed-title"
     | "title"
-    | "translated-title"
     | "volume-title"
 
   ## String variables