Fix MacVim's locale not having encoding when launched from Dock #1036
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When launching MacVim not from terminal, macOS doesn't set the $LANG environment variable, and the locale API doesn't have a way to return the encoding (probably because everything is UTF-8). As such Vim would set the locale to something like "en_US", which breaks certain tools that expects an encoding part set.
Fix this by simply appending ".UTF-8" to the constructed locale (e.g. "en_US.UTF-8") if $LANG doesn't exist. This makes sense as we default to UTF-8 in MacVim and macOS is basically UTF-8 native anyway.
Also, add a test that will make sure this is the case.
Fix #1033