feat(translate): add namespace prefix + separator grid option

[ghiscoding]

No description provided.

[codecov]

Codecov Report

Merging #462 into master will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##            master      #462    +/-   ##
==========================================
  Coverage   100.00%   100.00%            
==========================================
  Files          146       146            
  Lines         9200      9223    +23     
  Branches      3186      3060   -126     
==========================================
+ Hits          9200      9223    +23     

Impacted Files	Coverage Δ
...slickgrid/components/slick-pagination.component.ts	100.00% <100.00%> (ø)
...odules/angular-slickgrid/editors/longTextEditor.ts	100.00% <100.00%> (ø)
.../modules/angular-slickgrid/editors/selectEditor.ts	100.00% <100.00%> (ø)
...gular-slickgrid/extensions/contextMenuExtension.ts	100.00% <100.00%> (ø)
...s/angular-slickgrid/extensions/extensionUtility.ts	100.00% <100.00%> (ø)
.../angular-slickgrid/extensions/gridMenuExtension.ts	100.00% <100.00%> (ø)
...ngular-slickgrid/extensions/headerMenuExtension.ts	100.00% <100.00%> (ø)
...s/angular-slickgrid/filters/compoundInputFilter.ts	100.00% <100.00%> (ø)
.../modules/angular-slickgrid/filters/selectFilter.ts	100.00% <100.00%> (ø)
.../angular-slickgrid/services/excelExport.service.ts	100.00% <100.00%> (ø)
... and 2 more

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