Fixes for fetch-language-data.sh (#360)

* Fixes for fetch-language-data.sh

* Portable path function, instead of `readlink -f`, which doesn't
  work on mac.
* Remove extra '/' character from DEST. It is added again later.
* Change "wrote" to "written" — clearer meaning of what was done.

* Update language-data

* Update sjd autonym
* Move ms-arab a few lines (automatic change from CLDR)

Updating to
b485f5a134

.gitignore

@@ -6,5 +6,6 @@
 /node_modules
 /dist
 data/supplementalData.xml
+/scripts/vendor
 /vendor
 .eslintcache