MonoGame localization and multilingual font guide covering JSON-based i18n (runtime file loading, no Content Pipeline), IStringLocalizer pattern with System.Text.Json, culture switching, SpriteFont CharacterRegions for non-ASCII languages (Spanish accents, Cyrillic, CJK), and TTF font setup. Use this skill whenever the user asks about translating a game, adding multiple languages, showing accented or non-Latin characters, ñ not rendering, missing glyphs, font charset, UTF-8 text issues, culture/locale switching, or loading text from JSON files — even if they just say "my Spanish text breaks" or "how do I add French support".
