[FIX] base: add German states

We need German states when formatting the 'SteurNummer'.
So we provide it so the user can select his, instead of having to
 create them by hand.

task-3056694
opw-2974560

closes odoo/odoo#107617

Related: odoo/enterprise#34853
Signed-off-by: William André (wan) <wan@odoo.com>

odoo/addons/base/data/res.country.state.csv

@@ -1385,6 +1385,22 @@ state_no_46,base.no,"Vestland","NO-46"
 state_no_30,base.no,"Viken","NO-30"
 state_no_22,base.no,"Jan Mayen","NO-22"
 state_no_21,base.no,"Svalbard","NO-21"
+state_de_bw,base.de,"Baden-Württemberg","DE-BW"
+state_de_by,base.de,"Bayern","DE-BY"
+state_de_be,base.de,"Berlin","DE-BE"
+state_de_bb,base.de,"Brandenburg","DE-BB"
+state_de_hb,base.de,"Bremen","DE-HB"
+state_de_hh,base.de,"Hamburg","DE-HH"
+state_de_he,base.de,"Hessen","DE-HE"
+state_de_mv,base.de,"Mecklenburg-Vorpommern","DE-MV"
+state_de_ni,base.de,"Niedersachsen","DE-NI"
+state_de_nw,base.de,"Nordrhein-Westfalen","DE-NW"
+state_de_rp,base.de,"Rheinland-Pfalz","DE-RP"
+state_de_sl,base.de,"Saarland","DE-SL"
+state_de_sn,base.de,"Sachsen","DE-SN"
+state_de_st,base.de,"Sachsen-Anhalt","DE-ST"
+state_de_sh,base.de,"Schleswig-Holstein","DE-SH"
+state_de_th,base.de,"Thüringen","DE-TH"
 state_ec_01,base.ec,Azuay,01
 state_ec_02,base.ec,Bolivar,02
 state_ec_03,base.ec,Canar,03