Easyling Changelog - v590

New features:

1113 feature backend proxy the `X-Forwarded-Proto` header to improve OpenResty compatibility with subdirectory publishing
1110 feature backend add MT support and error reporting to DCT API
1114 feature backend handle `
1115 feature backend add last encountered status to Excel page list export

Fixes:

1116 fix backend fix TMX download link access for owners and APMs
1112 fix backend TMX import handles `it` tags correctly