It's always amusing to see what the Author's own take is on placenames.
The badge has the official spelling be "Alsane" and "Curvann"
(Although it's also "Balance Scale of Silvee", so authorial typos might also be present)
Anyway, I decoded the cerification to
.dventurers guil.
Alsane Curvann ?ol?
Reiji
Bronze Rank
Balance scale of Silvee
(dots being obscured runes, but the meaning "Adventurers Guild" comes through pretty clearly)
(the two question marks are runes I didn't manage figure out easily)
Edit:
The next chapter cleared up one rune, so the second line is now:
Alsane Curvann ?oly
(It also made it clear that typos can be expected among the runes)