add russia, slovakia and slovenia to flag similarities (en and de)

for other languages descriptions are missing

src/data/flag_similarity.csv

@@ -41,3 +41,6 @@ Sahrawi Arab Democratic Republic,"Jordan (star on left), Palestine (no symbols)"
 Sudan,"Palestine (red arrow, green stripe)","Palästina (roter Pfeil, grüner Streifen)","Palestina (triángulo rojo, banda verde)","Palestine (flèche rouge, bande verte)","Palestina (rød trekant, grønn stripe)","Stát Palestina (červená šipka, zelený pruh)","Палестина (красная стрелка, зеленая полоса)","Palestina (rode pijl, groene streep)","Palestina (röd triangel, grönt band)"
 Luxembourg,Netherlands (darker blue),Niederlande (dunkleres Blau),Países Bajos (azul más oscuro),Pays-Bas (bleu plus foncé),Nederland (mørkere blå),Nizozemsko (tmavší modrá),Нидерланды (темно-синий),Nederland (donkerder blauw),Nederländerna (mörkare blå)
 Netherlands,Luxembourg (lighter blue),Luxemburg (helleres Blau),Luxemburgo (azul más claro),Luxembourg (bleu plus clair),Luxembourg (lysere blå),Lucembursko (světlejší modrá),Люксембург (светло-голубой),Luxemburg (lichter blauw),Luxemburg (ljusare blå)
+Russia,"Slovakia (coat of arms with double cross), Slovenia (coat of arms with mountain and stars)","Slowakei (Wappen mit Doppelkreuz), Slowenien (Wappen mit Berg und Sternen)","Eslovaquia, Eslovenia","Slovaquie, Slovénie","Slovakia, Slovenia","Slovensko, Slovinsko","Словакия, Словения","Slowakije, Slovenië","Slovakien, Slovenien"
+Slovakia,"Russia (no coat of arms), Slovenia (coat of arms with mountain and stars)","Russland (kein Wappen), Slowenien (Wappen mit Berg und Sternen)","Rusia, Eslovenia","Russie, Slovénie","Russland, Slovenia","Rusko, Slovinsko","Россия, Словения","Rusland, Slovenië","Ryssland, Slovenien"
+Slovenia,"Russia (no coat of arms), Slovakia (coat of arms with double cross)","Russland (kein Wappen), Slowakei (Wappen mit Doppelkreuz)","Rusia, Eslovaquia","Russie, Slovaquie","Russland, Slovakia","Rusko, Slovensko","Россия, Словакия","Rusland, Slowakije","Ryssland, Slovakien"