Add some Latin-1 characters for signs

mods/ITEMS/mcl_signs/characters.txt

@@ -283,3 +283,90 @@ _co
 `
 _gr
 2
+ä
+_ae
+5
+ë
+_ee
+5
+ï
+_ie
+5
+ö
+_oe
+5
+ü
+_ue
+5
+Ä
+_ae_
+5
+Ë
+_ee_
+5
+Ï
+_ie_
+5
+Ö
+_oe_
+5
+Ü
+_ue_
+5
+ß
+_sz
+5
+×
+_times_cross
+5
+·
+_times_dot
+5
+÷
+_div
+5
+»
+_guill_right
+5
+«
+_guill_left
+5
+¢
+_cent
+5
+¿
+_qu_inv
+5
+±
+_plus_minus
+5
+©
+_copyright
+5
+®
+_registered
+5
+¨
+_diaresis
+5
+§
+_paragraph
+5
+¦
+_broken_bar
+5
+¥
+_yen
+5
+¤
+_currency
+5
+£
+_pound
+5
+µ
+_mu
+5
+¡
+_ex_inv
+5