Add SpecificNames for the phases of the Germans

Sources:
https://en.wiktionary.org/wiki/Reconstruction:Proto-Germanic/w%C4%ABhs%C4%85
https://en.wiktionary.org/wiki/Reconstruction:Proto-Germanic/burgz
https://en.wiktionary.org/wiki/Reconstruction:Proto-Germanic/haimaz

See https://wildfiregames.com/forum/topic/140596-specific-phase-names-for-the-germans

Fixes #4667

binaries/data/mods/public/simulation/data/technologies/phase_city_generic.json

@@ -4,6 +4,7 @@
 		"brit": "Dūnon",
 		"cart": "Qart",
 		"gaul": "Dūnon",
+		"germ": "Burgz",
 		"han": "Jùn",
 		"iber": "Iltir",
 		"kush": "Ri",

binaries/data/mods/public/simulation/data/technologies/phase_town_generic.json

@@ -4,6 +4,7 @@
 		"brit": "Bona",
 		"cart": "Ir",
 		"gaul": "Bona",
+		"germ": "Wīhsą",
 		"han": "Xìan",
 		"iber": "Contrebia",
 		"kush": "Dmj",

binaries/data/mods/public/simulation/data/technologies/phase_village.json

@@ -5,6 +5,7 @@
 		"brit": "Ialon",
 		"cart": "Kapr",
 		"gaul": "Ialon",
+		"germ": "Haimaz",
 		"han": "Xiāng",
 		"iber": "Treba",
 		"kush": "Wḥyt",