feat(instance): data locations as precise as a country or a state

halkyon_shared's 96f2d14: an operator's DATA_LOCATION and
BACKUP_LOCATION may name a subdivision (ISO 3166-2, US-CA, DE-BY)
besides the EU or a country, and the app adds "(EU)" to a member
country and the country to a subdivision ("Germany (EU)", "California,
United States") under the most specific flag there is. deploy/.env and
the backups' guide say so; a Storage Box is named by its country now.
The package registers its notices (the flags, CLDR's subdivision
names); Learn's own CLDR notice for the world map stays, its
registration renamed to say so.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: Tizian 「ティツィアーン」 <raisondetredev@pm.me>

deploy/.env.example

@@ -82,9 +82,12 @@ SOURCE_URL=
 JELLYFIN_URL=
 
 # Where this instance keeps people's data, and its backups, which the app shows as a flag
-# and in words when someone chooses an instance: a country's code (ISO 3166-1 alpha-2,
-# `CH`) or `EU`; for the backups also `none`. Where the disks are, not which law governs
-# you as the operator: claim only that. Empty: the app says nothing.
+# and in words when someone chooses an instance: `EU`, a country's code (ISO 3166-1
+# alpha-2, `DE`, `CH`) or a subdivision's (ISO 3166-2, `DE-BY`, `US-CA`); for the backups
+# also `none`. As precise as you know: the app adds "(EU)" to a member country and the
+# country to a subdivision ("Germany (EU)", "California, United States"). Where the disks
+# are, not which law governs you as the operator: claim only that. Empty: the app says
+# nothing.
 DATA_LOCATION=
 BACKUP_LOCATION=