Fix for issue #1369 (improvements for WAGettextExporter)

[jbrichau]

Tackles issues mentioned in #1369

[codecov]

Codecov Report

Patch coverage: 94.03% and no project coverage change.

Comparison is base (ec8c4a2) 54.14% compared to head (b642301) 54.15%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1370   +/-   ##
=======================================
  Coverage   54.14%   54.15%           
=======================================
  Files        8876     8883    +7     
  Lines       72097    72141   +44     
=======================================
+ Hits        39037    39067   +30     
- Misses      33060    33074   +14     

Impacted Files	Coverage Δ
...etTextExporter.class/class/newForRBEnvironment..st	0.00% <0.00%> (ø)
...mentsFinder.class/instance/translatedArguments..st	0.00% <0.00%> (-100.00%)	⬇️
...tExporter.class/instance/createAndSortTriplets..st	100.00% <100.00%> (ø)
.../WAGetTextExporter.class/instance/createHeaders.st	100.00% <100.00%> (ø)
...class/instance/createStringMethodRefDictionary..st	100.00% <100.00%> (ø)
...tTextExporter.class/instance/currentDateAndTime.st	100.00% <100.00%> (ø)
.../WAGetTextExporter.class/instance/exportCatalog.st	100.00% <100.00%> (ø)
...e/WAGetTextExporter.class/instance/exportHeader.st	100.00% <100.00%> (ø)
...orter.class/instance/exportHeaderLineKey.value..st	100.00% <100.00%> (ø)
.../WAGetTextExporter.class/instance/formatString..st	100.00% <100.00%> (ø)
... and 10 more

... and 1 file with indirect coverage changes

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