Encoding filename in Content-Disposition header

[hashtagnulla]

Previously, when a user tried to upload a file that's filename included non-ascii characters, the frontend couldn't build the header and the process was interrupted. Now it's fixed :)

[CLAassistant]

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (e194979) 92.47% compared to head (6b1f420) 92.47%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #1596 +/- ## ======================================== Coverage 92.47% 92.47% ======================================== Files 253 253 Lines 7149 7149 Branches 1937 1937 ======================================== Hits 6611 6611 Misses 538 538 ```

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