It looks like Apple introduced a nasty "line-break removal"-bug on all accounts/apps while trying to fix their security issues of the developer center.
Video documenting the bug: http://dt.pe/M92QWG
Possible workaround: Update your description using Apple’s command-line delivery tool (https://itunesconnect.apple.com/transporter/1.7.6/iTMSTransporter_1.7.6.pkg.gz)
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Why not to update your app description on iTunes Connect | Heykuki News