build: Correct app version and enable automated upload to Google Play

Change-Id: I253bb795b65dfc4cff52c244c824d42f7fc71c17
diff --git a/app/src/main/play/defaultLanguage b/app/src/main/play/defaultLanguage
new file mode 100644
index 0000000..f2b0341
--- /dev/null
+++ b/app/src/main/play/defaultLanguage
@@ -0,0 +1 @@
+en-US
\ No newline at end of file