[MC-309906] The term "Friends List" is inconsistently capitalized across strings

The term “Friends List” is inconsistently capitalized across strings.

We should pick a convention and stick to it. I believe “Friends List” is the best choice to standardize on here, as it’s currently the most used.

Before reading the table, please note the following:

Translation Key	Current String	Expected String	String URL on Crowdin
gui.friends.toast.join_request.message	%s wants to join your world. Open the Friends list with "%s" or from the game menu.	%s wants to join your world. Open the Friends List with "%s" or from the game menu.	https://crowdin.com/editor/minecraft/10038/enus-engb?view=comfortable#5439663
gui.friends.toast.invite_from_friend.message	%s invited you to join their world. Open the friends list by pressing "%s" to join	%s invited you to join their world. Open the Friends List by pressing "%s" to join	https://crowdin.com/editor/minecraft/10038/enus-engb?view=comfortable#5439659
gui.friends.toast.friend_removed.message	%s has been removed from your friends list	%s has been removed from your Friends List	https://crowdin.com/editor/minecraft/10038/enus-engb?view=comfortable#5439653
gui.friends.validation.already_friend	%s is already on your Friends List	%s is already on your Friends List	https://crowdin.com/editor/minecraft/10038/enus-engb?view=comfortable#5439868
options.friendsList.confirm.message	Use your Friends List to send and receive friend requests. Manage online safety settings with your %s.	Use your Friends List to send and receive friend requests. Manage online safety settings with your %s.	https://crowdin.com/editor/minecraft/10038/enus-engb?view=comfortable#5439743

Display any of the affected strings as listed above by using the command provided below and replacing "XYZ" with the string's translation key.
```
/tellraw @s {"translate":"XYZ"}
```
Look closely at the said words within the string.

The term is inconsistently capitalized.

The term would be consistently capitalized.

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