i18n Thai Authenticator (#5436)

Author: vLannaAi

.changeset/cool-baboons-whisper.md

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+'@aws-amplify/ui': minor
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+i18n Authenticator in Thai.
+Localization of Authenticator in the Thai Language.
+Added a new language using the ISO code 'th'
+Created a new dictionary for Authenticator strings, and localized with supervision of 3 Thai native speaker, verified by ChatGPT 4.o, Claude Sonnet 3.5, and Google Translate.