updated manifest to use short links

manifest.yaml

@@ -7,7 +7,7 @@ dublin_core:
   creator: 'Wycliffe Associates'
   description: 'An unrestricted visual mini-Bible in any language'
   format: 'text/markdown'
-  identifier: 'en-obs'
+  identifier: 'obs'
   issued: '2015-08-26'
   language:
     direction: 'ltr'
@@ -16,13 +16,13 @@ dublin_core:
   modified: '2017-01-10'
   publisher: 'Door43'
   relation:
-    - 'en-tw-obs'
-    - 'en-tq-obs'
-    - 'en-tn-obs'
+    - 'en/tw'
+    - 'en/tq'
+    - 'en/tn'
   rights: 'CC BY-SA 4.0'
   source:
     -
-      identifier: 'en-obs'
+      identifier: 'obs'
       language: 'en'
       version: '4'
   subject: 'Bible stories'