About the other faction names,
Translation Error: 北部帝国 (Northen Empire), 南部帝国 (Southern Empire), 西部帝国 (Western Empire)
Corrected Translation: 北帝国 (Northen Empire), 南帝国 (Southern Empire), 西帝国 (Western Empire)
In Japanese, we does not use “部” for country names. For example Eastern Roman Empire is 東ローマ帝国, South Africa is 南アフリカ.