Update en-GB.txt

[IntelOrca]

Make the casing of 'open custom content folder' consistent with the other menu items on the toolbox.

[Gymnasiast]

The rest of the items are all names for tools, except "Convert saved game to scenario". Names in English typically capitalise more words.

Basically, I don't think this change is correct.

[pizza2004]

It's not grammatically correct if we look at this as a sentence, but I think it /looks/ better if it matches the other menu items personally, and this isn't meant to be a sentence. You could also make an argument that it /is/ the name, being the name of a menu item.

Grammar is more of a suggestion than a rule, used to make sure that stuff is consistent so that communication is easier, and making this capitalized doesn't harm communication at all.

[qwertychouskie]

IMO this should stay the same, and "Convert Saved Game to Scenario" should maybe be changed to "Convert saved game to scenario". The difference is that e.g. "Track Editor" is a title while "Open custom content folder" isn't a title, it's an action.

[Gymnasiast]

For the reasons mentioned above, I'm closing this PR.