Localisation on game titles sometimes appear wrong (bugs)
Twitch uses data from IGDB, but there are some errors where this data isn't applied properly. IGDB uses the North American (NA) title by default, and has the European title as the alternative, even in situations where the European title is the original or matching the original better.
The schedule on twitch.tv uses the NA title regardless of locale selected. Both the small item of the schedule, as well as when you click on it to expand it. But the cover used is localised.
The video producer on dashboard.twitch.tv use the NA title regardless of locale, when you edit a video to change the category. But searching for category does use the localised title.
The languages Norwegian, Russian, Turkish does not use the title listed as European on IGDB and defaults to the NA title.
When you open a category-page on twitch.tv, the page-title is using the localised title ending with " - Twitch". But if you click on the tab Videos or Clips, it's now using the NA title instead.

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PonPonTheBonBon commented
Another place where it also shows up wrong:
- On the dashboard when you check clips you made or clips for your channel, the category is using the NA title instead of the localised title.
- This is also causing a bug. When filtering clips by category, the filter is using the localised title and finds no clips if it differs from the NA title, but works fine if it is the same as the NA title. This is an odd bug because certainly it should base the match on the ID (unchanged on locale) than the title. -
PonPonTheBonBon commented
For the following game:
https://www.twitch.tv/directory/game/Need%20for%20Speed%3A%20High%20Stakes
The European title is "Need for Speed: Road Challenge", applies to the European languages. Other translations are:
Japanese: "オーバードライビンIV"
German: "Need for Speed: Brennender Asphalt"
French: "Need for Speed : Conduite en état de liberté"
Portuguese - Brazil: "Need for Speed: Road Challenge"