Github user greghogan commented on the pull request:
https://github.com/apache/flink/pull/1525#issuecomment-173371188
Ah, okay, so I ran the UI but neglected to note that the "fonts" were
missing. Turns out the spec for [bower.json](
https://github.com/bower/spec/blob/master/json.md#main) now prefers
pre-processed files. Font Awesome was
[updated](https://github.com/FortAwesome/Font-Awesome/commit/7cde41ea934f43e66dc123ea6411d8535b50a4f7)
for the new spec and our `gulpfile.js` needed to be modified to include
`font-awesome.css` in the aggregated `vendor.css`.
Rather than downgrading Font Awesome back to 4.3.0 or including an override
in `bower.json` I updated `gulpfile.js` to pre-process and include any `LESS`
files in bower dependencies (as was already being done for Flink's
`bootstrap_custom.less`).
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