Typo in API calls

[shahnewaz-labib]

This is a rather silly one.

To get tafsir by ibn kathir, an example URL is:
https://staging.quran.com/api/qdc/tafsirs/en-tafisr-ibn-kathir/by_ayah/65:12
Here, tafisr should be changed to tafsir

This also causes typo in the url of the frontend, which is described in the issue here