[MC-279189] The "mco.configure.world.leave.question.line1" string is missing a comma

The Bug:

The "mco.configure.world.leave.question.line1" string is missing a comma.

Within the English language, commas don't always need to be used however, they are typically used when a dependant clause (a clause that cannot stand alone as a sentence and needs to be joined with an independent clause to make sense) comes before an independent clause (a clause that can form a complete sentence standing alone).

With this string in particular, the dependent clause comes before the independent clause, therefore a comma should be used.

Affected String:

Before reading the table, please note the following:

Words colored in GREEN are correct.
Words colored in RED are incorrect.

Translation Key	Current String	Expected String	String URL on Crowdin
mco.configure.world.leave.question.line1	If you leave this realm you won't see it unless you are invited again	If you leave this realm, you won't see it unless you are invited again	https://crowdin.com/editor/minecraft/10038/enus-engb?view=comfortable#5342548

Steps to Reproduce:

Display the affected string as listed above by using the command provided below.
```
/tellraw @s {"translate":"mco.configure.world.leave.question.line1"}
```
Observe if the string contains a comma where appropriate.

Observed Behavior:

The said string is missing a comma.

Expected Behavior:

The said string would have a comma present where appropriate.