Title consistency

Remaining strict issues at the time this MR was merged:

• #43 (closed)
  • ep03/br
    • cover: An aozennoù kevrinus
    • title: An aozenn gevrinus
  • ep01/ph
    • cover: Salamangka ng Paglipad
    • title: Ang Salamangka ng Paglipad
• ep02/ca
  • cover: Les pocions de l'arc de Sant Martí
  • title: Les pocions de l'Arc de Sant Martí
• ep11/eo
  • cover: La Sorĉistinoj de Ĥaosaho
  • title: La sorĉistinoj de Ĥaosaho
• ep20/fr
  • cover: Le Pique-Nique
  • title: Le Pique-nique
• ep21/fr
  • cover: Le concours de Magie
  • title: Le Concours de Magie
• ep21/io
  • cover: La konkurso di magio
  • title: La Konkurso di Magio
• ep03/ph
  • cover: Ang Sikretong Sangkap
  • title: Ang sikretong sangkap
• ep11/ph
  • cover: Ang Mga Bruha Ng Chaosah
  • title: Ang mga Bruha ng Chaosah
• ep12/sr
  • cover: Јесење Чишћење
  • title: Јесење чишћење
• ep02/sz
  • cover: Dyngowe mikstury
  • title: Dyngowe Mikstury
• ep02/vi
  • cover: Thuốc Cầu Vồng
  • title: Thuốc cầu vồng
• Incorrect spaces before colons in a lot of languages
• Inconsistent and incorrect casing (Upper Case / lower case) in a lot of languages