Add ESRB rating for Personal Trainer: Math (+ Revised Title Names)

[PW5190]

What's changed?

I decided to revise and change the names of certain games, plus, add a rating for Personal Trainer: Math.

Where have you tested it?

I tested on a New Nintendo 2DS XL with LumaCFW, running a TWLMenu++ (nightly b860e84) build.

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Pull Request status

• [X] This PR has been tested using the latest version of devkitARM and libnds.