feat: completed Dutch translations

[pmjherman]

• feat: I have completed the nl_NL translations, to incorporate all the new terms after recent changes in the user interface. Only the Dutch translation file is affected.

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[pmjherman]

Sorry, I was too early with making the pull request. I now found out that a test failed because in the History dialog there is a string "Point Length and Angle from point %2" which has a placeholder %2, but not a placeholder %1. Or at least that is how I understand it. The literal text from the test log is:
"FAIL! : TST_TSTranslation::CheckPlaceMarkerExist(File 'seamly2d_nl_NL.ts'. Check place holder source message 'Point Length and Angle from point %2') In source string 'Point Length and Angle from point %2' was missed place marker '%1'.
Loc: [../../../../Seamly2D/src/test/TranslationsTest/tst_tstranslation.cpp(289)]"

I do not think this can be corrected in the translation file. Is it a problem in the source?

[csett86]

Looks good to me, thank a lot @pmjherman