Template updates for 38C3 before acceptance mails
- Sync content between both variants (acceptance & scheduling)
- Grammar improvements and typo fixes
- Remove services we don't really provide (travel booking assistance)
- Remove duplicate sentence, mention YouTube
- Adjust everyhting for a Pretalx world
- Remove slide upload from the first checklist, add TODO notice to second
- Sync venue info, update year
Edited by F30