The team is aware of this issue - which affects players with their devices set to specific variations of English - and is working on a fix. In the meantime, you can resolve this issue yourself by manually setting the language in the game as follows:
1. After loading the game, select either the green, red, or yellow option from the blue screen (below). From the popup that appears, select the left button.
2. You'll now be taken to the game's tutorial. To skip it tap the button at the top right (highlighted with a green dotted line below). A popup will appear again; tap the left option to proceed.
3. You'll now be taken to the title screen. Tap to proceed further, then tap the Cog icon at the top left (highlighted with a green dotted line below) until the Settings Menu appears.
4. From the settings menu, chose the second-from-bottom option.
5. The Language Settings menu will open. Tap the top option to open the Language Selection menu. You'll be presented with a grid of different languages. Select an appropriate language here. A popup will appear - select the left option (highlighted in green below) to confirm your choice.
6. You'll now be taken back to the title screen, and all text will now appear correctly.