Use "custom" locale in iterm2

This is potentially a bug in the current iTerm version: set the language
to `en-US.UTF-8` - just to silence a popup on start, that the
computer's current language settings cannot be found.

iterm/com.googlecode.iterm2.plist

@@ -1240,6 +1240,8 @@
 			<string>No</string>
 			<key>Custom Directory</key>
 			<string>Recycle</string>
+			<key>Custom Locale</key>
+			<string>en_US.UTF-8</string>
 			<key>Default Bookmark</key>
 			<string>No</string>
 			<key>Disable Printing</key>
@@ -1691,7 +1693,7 @@
 			<key>Send Idle Alert</key>
 			<false/>
 			<key>Set Local Environment Vars</key>
-			<true/>
+			<integer>2</integer>
 			<key>Shortcut</key>
 			<string></string>
 			<key>Silence Bell</key>