Add more teams for !goals command

[FelixRandle]

Currently the !goals command only supports Arsenal, Chelsea and Spurs because I'm lazy,

Need to update here to include more team IDs, can be retrieved by finding the team's URL on fbref like below

https://fbref.com/en/squads/19538871/Manchester-United-Stats

Key in dictionary is the value the user will type in, numbers in the URL is the value. Ensure that the key is all lowercase.

Adding in Man U would make it look something like below.

        self.CLUB_ID_TRANSLATIONS = {
            'arsenal': '18bb7c10',
            'chelsea': 'cff3d9bb',
            'spurs': '361ca564',
            'man united': '19538871'
        }

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