Add Western Armenian

The code "hyw" has been approved:
http://www-01.sil.org/iso639-3/cr_files/639-3_ChangeRequests_2017_Summary.pdf
http://www-01.sil.org/iso639-3/cr_files/PastComments/CR_Comments_2017-023.pdf

This was requested for translatewiki:
https://translatewiki.net/wiki/Thread:Support/Add_support_for_Western_Armenian_(hym)
(in case it's not clickable, try http://bit.ly/2GzMuNZ )

data/langdb.yaml

@@ -215,6 +215,7 @@ languages:
   hu-formal: [Latn, [EU], Magyar (magázó)]
   hu: [Latn, [EU], magyar]
   hy: [Armn, [EU, ME], Հայերեն]
+  hyw: [Armn, [EU, ME], արեւմտահայերէն]
   hz: [Latn, [AF], Otsiherero]
   ia: [Latn, [WW], interlingua]
   id: [Latn, [AS], Bahasa Indonesia]

language-data.json

@@ -1358,6 +1358,14 @@
             ],
             "Հայերեն"
         ],
+        "hyw": [
+            "Armn",
+            [
+                "EU",
+                "ME"
+            ],
+            "արեւմտահայերէն"
+        ],
         "hz": [
             "Latn",
             [