fix(filter): Select Filter should use default locale without translation

[ghiscoding]

• when user is using only a single Locale, the Select Filter (single/multi) should use the Locale text instead of the translation text

[codecov]

Codecov Report

Merging #503 into master will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##            master      #503    +/-   ##
==========================================
  Coverage   100.00%   100.00%            
==========================================
  Files          148       148            
  Lines         9556      9557     +1     
  Branches      3192      3329   +137     
==========================================
+ Hits          9556      9557     +1     

Impacted Files	Coverage Δ
.../modules/angular-slickgrid/filters/selectFilter.ts	100.00% <100.00%> (ø)

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