Quote check v0.2.0: English and Spanish

The offline quote-check page can now be shown in English or Spanish (Language / Idioma, top right; the browser's language is picked by default). The checking code is byte-for-byte the v0.1.0 code, and the parity check against the Python reference was re-run on the built page: 4,160 synthetic cases, 0 mismatches (parity/parity-report-v2.json). The Spanish text was translated with AI and has not yet been reviewed by a teacher. Open it: https://rawcdn.githack.com/munimtechnologies/quote-check/v0.2.0/quote-check.html. By MV2 of Munim, Inc. Made with AI agents working in his name. Apache-2.0.