Thank you both for help / interest.
I've checked just to be sure (iGO 8.3.5.231128) - replacing just maps with 2017.06 makes things to go as expected (displayed: Graz).
Removing phoneme (iGO 8.3.5.193799) - no difference with 2017.12 and 2018.06 (crashing with 2018.03 and 2018.06 first release / before fix).
Switching to Serbian language (iGO 8.3.5.193799), w/o phoneme files - Maribor displayed with latin letters (same as in Slovenain letters), Graz dispalyed as Grac and Klagenfurt as Klagenfurtska or so (in Cyrillic - hope to read it correctly, don't practice much recently...).
Switching to English (UK), iGO 8.3.5.193799, w/o phoneme files - Graz is Graz, Wien is Vienna - as expected.
Seems to me that TomTom has done something wrong (maybe somehow related to issues with recent versions causing iGO / Primo to crash?). Is there any guide about how to mess with map files - probably possible only with hex editor (to correct the language codes)?
Tested also with Primo 9.6.5.306142 and primo 9.6.13.405512.
It is interesting that switching to Serbian Latin (author: BD) displays names in original language (Graz, Wien etc.), while switching to English (UK) displays Vienna. All for TomTom 2018.06 maps (latest, with fix).
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