Replace 'iPad' with tablet in content that is for both platforms

[chrisgarrity]

In content that was written before the Android version 'iPad' is used to refer to the device rather than tablet (mostly in the Teach section). It was noticed by translators.

In the teach...curricula and teach ... assessments sections the content refers to iPads instead of tablets. For example:
https://github.com/LLK/scratchjr-website/blob/ae646dcd8811682672db4cbabf58a5e43330770c/src/views/teach/curricula/animatedgenres/home.jsx#L22-L24

[R4356th]

@chrisgarrity, in which files exactly are the faults or are they fixed?

[leahcimto]

@chrisgarrity I could do this if help is still wanted