Tweak for part 1 of #400

[yuya-oc]

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Summary
The part 1 of #400.

• Some tweak of labels
• Remain settings page on clicking "x" button when there are no servers in config.

Issue link
#400

Test Cases

1. Open settings page.
2. Click "x" on top right of UI.
3. If no servers are saved yet, the settings page remain open.

Additional Notes
artifacts: https://circleci.com/gh/yuya-oc/desktop/142#artifacts

[jasonblais]

It works for me on Win10, thanks @yuya-oc!

As a future improvement, we could consider disabling or hiding the 'x' on the top corner of the page (similar to the "Save" button) when no servers have been added.

[yuya-oc]

Thanks! Now the button is disabled when no servers have been saved.

https://circleci.com/gh/yuya-oc/desktop/143#artifacts

[jasonblais]

Thanks @yuya-oc! I tried, but it seems like the button isn't disabled (clicking it performs the same action as "cancel"

However, I'm wondering if this is needed after PART 3 in #401

If the user has no servers, then the 'add server' dialog should appear automatically, I think.

[yuya-oc]

@jasonblais Sorry, my description was a little insufficient. In the latest, the close button performs when there are servers in "saved" settings. It's proposal in this PR.
Once servers are saved, users can go back to main page even if the list is blank.

[jasonblais]

Cool, that sounds reasonable. This is good to merge now, thanks! 👍