change wording in Metadata Detail page

[boney-bun]

change Projection System into Coordinate Reference System in Metadata Detail page

fix #418

[codecov]

Codecov Report

Merging #479 into 2.8.x-qgis_server will not change coverage.
The diff coverage is n/a.

@@                Coverage Diff                 @@
##           2.8.x-qgis_server     #479   +/-   ##
==================================================
  Coverage              41.43%   41.43%           
==================================================
  Files                    403      403           
  Lines                  28878    28878           
  Branches                3667     3667           
==================================================
  Hits                   11965    11965           
  Misses                 16173    16173           
  Partials                 740      740

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[boney-bun]

a simple fix. i'm going to merge this