Changed the example locale from U.S. English to English

Author: Brant Thomsen

lib/avtp_pipeline/avdecc/avdecc.ini

@@ -47,7 +47,7 @@ serial_number = "12345"
 # A UTF-8 string defining the localization language to use for localized
 # strings.  The format is "language code - region code".
 # Refer to IEEE Std 1722.1-2013 clause 7.2.11 for more details.
-locale_identifier = "en-US"
+locale_identifier = "en"
 
 # The vendor_name is a localized UTF-8 string defining the vendor's name
 vendor_name = "Acme Audio Inc."