Add function to fix some message formatting

[DayV-git]

Description:

Working on fixing the grammar / incorrect punctuation in bot messages. First step is defining a function that creates X, Y or Z and X, Y and Z strings instead of X, Y, Z. Implemented and added in a handful of places. If accepted, further PRs will add function in more places, and generalise to deal with other grammar errors.

Changes:

• Define new util function joinStrings to better combine strings in bot messages.
• Updated some files (namely colosseum, diary, CAs and music cape reqs) as examples.

Other checks:

• I have tested all my changes thoroughly.