nls: add additional localizations

[vince-fugnitto]

What it does

In additon to #11367, I noticed a couple of other instances where we do no localize.
The pull-request updates both the open and save dialog to localize all user facing strings, including tooltips.

How to test

1. confirm that the strings updated in the pull-request are not actually localized when changing display language on master
2. the strings should be properly localized when we perform Regular translation update #10885.

Review checklist

• As an author, I have thoroughly tested my changes and carefully followed the review guidelines

Reminder for reviewers

• As a reviewer, I agree to behave in accordance with the review guidelines

[msujew]

Thanks, LGTM 👍

[vince-fugnitto]

Sorry @msujew, I noticed that the keyboard shortcuts widget was completely not localized so I added a commit for it, should I open a separate pull-request instead? I might do a pass to see if we have other areas that are no localized.

[msujew]

@vince-fugnitto I'm fine with having multiple non-localized areas fixed in a single PR.

[vince-fugnitto]

I went ahead and updated other occurrences of missing localisations I could identify 👍

[msujew]

@vince-fugnitto Thanks 👍 Do you plan on merging this today? I could include it in the localization update.

[vince-fugnitto]

@msujew thank you! please go ahead :)