removes space and a few other characters from the file name in download section

[boney-bun]

fix #360

[codecov[bot]]

Codecov Report

Merging #478 into 2.8.x-qgis_server will increase coverage by 2.87%. The diff coverage is 83.33%.

@@                  Coverage Diff                  @@
##           2.8.x-qgis_server     #478      +/-   ##
=====================================================
+ Coverage              38.66%   41.54%   +2.87%     
=====================================================
  Files                    403      403              
  Lines                  28878    28882       +4     
  Branches                3667     3667              
=====================================================
+ Hits                   11167    11998     +831     
+ Misses                 16966    16140     -826     
+ Partials                 745      744       -1

Impacted Files	Coverage Δ
geonode/maps/qgis_server_views.py	64.42% <100%> (+0.22%)	:arrow_up:
geonode/qgis_server/views.py	57.78% <75%> (+0.33%)	:arrow_up:
geonode/services/views.py	22.54% <0%> (ø)	:arrow_up:
geonode/security/utils.py	34.3% <0%> (ø)	:arrow_up:
geonode/qgis_server/helpers.py	68.9% <0%> (+0.53%)	:arrow_up:
geonode/api/api.py	63.74% <0%> (+0.72%)	:arrow_up:
geonode/qgis_server/models.py	81.95% <0%> (+0.75%)	:arrow_up:
geonode/qgis_server/signals.py	86.19% <0%> (+0.83%)	:arrow_up:
geonode/api/resourcebase_api.py	43.95% <0%> (+0.87%)	:arrow_up:
geonode/geoserver/signals.py	15.48% <0%> (+0.88%)	:arrow_up:
... and 35 more

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[gubuntu]

fix and merge asap @boney-bun

[boney-bun]

@lucernae is there a way to bypass travis in order to merge PRs? i can't merge this PR (and a few others) since the travis failed on geoserver backend. the error does not related to the code, but the connection is terminated from the travis.

[lucernae]

We will merge this despite travis error due to #501