Add i18n module: MessageSource, LocaleResolver and localized ProblemDetail

English, Marathi and Hindi bundles behind one small web app, with tests that run it on a real
port and write the transcripts (01-11) quoted in the article, plus a jar-metadata capture (12).

Co-Authored-By: Claude Sonnet 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01Uu7q8vPeREyT4218EJPzz1
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Claude
2026-09-24 09:54:55 +00:00
parent e59ff029a1
commit 2cbf31e7d5
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# The JVM's default locale is Hindi: what does a French or an English request get?
Locale.getDefault() while these ran: hi
--- spring.messages.fallback-to-system-locale left at its default ---
Accept-Language: fr -> status=200 locale=fr message=नमस्ते, Asha!
Accept-Language: en -> status=200 locale=en message=नमस्ते, Asha!
--- spring.messages.fallback-to-system-locale=false ---
Accept-Language: fr -> status=200 locale=fr message=Hello, Asha!
Accept-Language: en -> status=200 locale=en message=Hello, Asha!