Add stage creation demo + fixes

• Fix separated child count labels ea1c667
• Fix error with 2-participant stages ab1cab9
• Keep fallback with partial english override 09a5e57
• Add BYE class 5b61b7b
• Add missing addLocale() back 09f4471
• Add bracket h2 titles d38fff1
• Update match results instead of reloading the page e9b9f30
• Remove useless stuff in lang.ts 53c5434
• Added the manager as dependency, updated demo with form to create stages (#67) b893261

v1.4.1...v1.4.2