NSLinguisticTagger detects Vietnamese as Romanian

Number:rdar://35888093 Date Originated:06-Dez.-2017 09:05 PM
Status:Duplicate/34807648/Open Resolved:
Product:iOS + SDK Product Version:11.2
Classification:Other Bug Reproducible:Always
The NSLinguisticTagger dominantLanguage API detects Vietnamese text as Romanian.

Steps to Reproduce:
	NSLinguisticTagger *tagger = [[NSLinguisticTagger alloc] initWithTagSchemes:tagschemes options:0];
	tagger.string = @"Thức ăn ngon, giá cả phải chăng. Tìm chổ đậu xe khó khăn nhưng chịu khó cũng có chổ ok.";
	NSLog("language: %@", tagger.dominantLanguage);

Expected Results:
it should log "vi"

Actual Results:
it logs "ro"




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