Refactored settings form

[drpayyne]

Description

Refactored labels in the settings form for consistency with other settings forms and grammar.

Contribution checklist

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with integration/functional tests (if applicable)
• All automated tests passed successfully (all builds are green)

[VitaliyBoyko]

Please remove the colon here and everywhere. We don't use it for form labels. Thanks

[drpayyne]

Hi @VitaliyBoyko, thanks for your review. I have made those changes since most of the form labels in default PhpStorm settings uses a colon as shown in the screenshot below. Is there a reason that we're deviating from that design?