unfamiliar language

[Charles Sabatos]

At the entrance to Auschwitz there is a wall with a short description
of the atrocities there, written in about 10 languages (English,
Polish, Russian, Hebrew, etc.)  The last one was a language written
in Latin characters (including a few Polish-looking letters like the
"L" with slash) but it didn't appear to be Slavic.  The flag drawn
above it was (I believe) blue and yellow, and in the middle was a
circle with spokes.  Would this be a Romany, or perhaps Baltic,
language?  Just wondering.