Update and fix issues with create from view

[floreks]

• Fixed an issue with unsaved changes dialog showing up when it shouldn't by slightly refactoring current logic
• Fixed an issue with some API error messages not being translated
• Moved Namespace option in the Create from form to the always visible options as it was not clear which namespace is selected and will be used to deploy the resource
• Fixed an issue with Create from file not working
• Fixed an issue with Preview feature not adding namespace field to resource preview YAML/JSON

Closes #6990

[codecov]

Codecov Report

Merging #7007 (c077c68) into master (f698d98) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #7007   +/-   ##
=======================================
  Coverage   41.82%   41.82%           
=======================================
  Files          45       45           
  Lines        1229     1229           
  Branches      161      161           
=======================================
  Hits          514      514           
  Misses        715      715           

[maciaszczykm]

/lgtm

[k8s-ci-robot]

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