feat(styling): add description to Compound Filter Operators

[ghiscoding]

• also change Compound Filter styling
• the new translations required are the following

{
      CONTAINS: 'Contains',
      EQUALS: 'Equals',
      ENDS_WITH: 'Ends With',
      STARTS_WITH: 'Starts With',
      EQUAL_TO: 'Equal to',
      LESS_THAN: 'Less than',
      LESS_THAN_OR_EQUAL_TO: 'Less than or equal to',
      GREATER_THAN: 'Greater than',
      GREATER_THAN_OR_EQUAL_TO: 'Greater than or equal to',
      NOT_EQUAL_TO: 'Not equal to',
}

[codecov]

Codecov Report

Merging #588 into master will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #588   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          148       149    +1     
  Lines         9831      9854   +23     
  Branches      3472      3479    +7     
=========================================
+ Hits          9831      9854   +23     

Impacted Files	Coverage Δ
src/app/modules/angular-slickgrid/constants.ts	100.00% <ø> (ø)
...es/angular-slickgrid/editors/autoCompleteEditor.ts	100.00% <100.00%> (ø)
...es/angular-slickgrid/filters/compoundDateFilter.ts	100.00% <100.00%> (ø)
...s/angular-slickgrid/filters/compoundInputFilter.ts	100.00% <100.00%> (ø)
.../angular-slickgrid/filters/compoundSliderFilter.ts	100.00% <100.00%> (ø)
...dules/angular-slickgrid/filters/filterUtilities.ts	100.00% <100.00%> (ø)
...pp/modules/angular-slickgrid/services/utilities.ts	100.00% <100.00%> (ø)

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