Hello Svetozar,
Thank you for contacting FTDNA! I do not see anything that would indicate that your mtDNA matches have Jewish ancestry, although you can always click on their name in your match list to get their email address from their profile and email them to ask. T2b5 is not a specifically Jewish haplogroup but that does not mean that there wouldn't be anyone who has this haplogroup with Jewish ancestry.
On the other hand, if you do an internet search for T2b5 or T2b5 in relation to Jewish ancestry, you can find more information. I always look at the Wikipedia page for a haplogroup, at least as a place to start and maps and find sources in the Wikipedia sources. I haven't looked into this so you will have to do your own homework, so to speak, but this article I found about "Sephardic signature in haplogroup T mitochondrial DNA" might interest you.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3306851/#
If someone is matching you on the mtFull Sequence test on all three coding regions (HVR1, HVR2, and the Coding Region) like these three people are that would mean that you and your matches have a common matrilineal ancestor within the last 24 generations or so, or roughly within the last 600 years. It would not be surprising if you had and your matches had an ancestor that far back in one of the German-speaking lands who had some descendants who went to Serbia and some who went to Scotland, maybe depending on whether they emigrated via the Danube or the Rhine. This is speculation but it is plausible. This wouldn't indicate that you have a German grandmother but rather that you and your matches would have had a common great-great-X-grandmother some time within the last 600 years or so.
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