CFBundleDevelopmentRegion should be "en" instead of "English"

This fixes issues where string resources are not found on ios tests.

Change-Id: Iaff172daad6100ba2036a90bd6e685c205ab8cbf
Reviewed-on: https://chromium-review.googlesource.com/c/1302328Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Commit-Queue: Dirk Pranke <dpranke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#604129}

testing/gtest_ios/unittest-Info.plist

@@ -5,7 +5,7 @@
 	<key>UIApplicationDelegate</key>
 	<string>MainApplicationDelegate</string>
 	<key>CFBundleDevelopmentRegion</key>
-	<string>English</string>
+	<string>en</string>
 	<key>CFBundleDisplayName</key>
 	<string>${PRODUCT_NAME}</string>
 	<key>CFBundleExecutable</key>