[CmdPal] Extension string updates (#43269)

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## Summary of the Pull Request

Feedback from the design team:
- Reduce any redundant or long text strings for better readability and
localization
- `Verb + noun` for most extensions
- Sentence casing according to the Windows Writing Guidelines


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## PR Checklist

- [ ] Closes: #xxx
- [ ] **Communication:** I've discussed this with core contributors
already. If the work hasn't been agreed, this work might be rejected
- [ ] **Tests:** Added/updated and all pass
- [ ] **Localization:** All end-user-facing strings can be localized
- [ ] **Dev docs:** Added/updated
- [ ] **New binaries:** Added on the required places
- [ ] [JSON for
signing](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ESRPSigning_core.json)
for new binaries
- [ ] [WXS for
installer](https://github.com/microsoft/PowerToys/blob/main/installer/PowerToysSetup/Product.wxs)
for new binaries and localization folder
- [ ] [YML for CI
pipeline](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ci/templates/build-powertoys-steps.yml)
for new test projects
- [ ] [YML for signed
pipeline](https://github.com/microsoft/PowerToys/blob/main/.pipelines/release.yml)
- [ ] **Documentation updated:** If checked, please file a pull request
on [our docs
repo](https://github.com/MicrosoftDocs/windows-uwp/tree/docs/hub/powertoys)
and link it here: #xxx

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## Detailed Description of the Pull Request / Additional comments

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---------

Co-authored-by: Michael Jolley <mike@baldbeardedbuilder.com>
Co-authored-by: Jiří Polášek <me@jiripolasek.com>

src/modules/cmdpal/Microsoft.CmdPal.UI.ViewModels/Commands/BuiltInsCommandProvider.cs

@@ -21,7 +21,7 @@ public sealed partial class BuiltInsCommandProvider : CommandProvider
 
     public override ICommandItem[] TopLevelCommands() =>
         [
-            new CommandItem(openSettings) { Subtitle = Properties.Resources.builtin_open_settings_subtitle },
+            new CommandItem(openSettings) { },
             new CommandItem(_newExtension) { Title = _newExtension.Title, Subtitle = Properties.Resources.builtin_new_extension_subtitle },
         ];
 

src/modules/cmdpal/Microsoft.CmdPal.UI.ViewModels/Properties/Resources.resx

@@ -117,11 +117,8 @@
   <resheader name="writer">
     <value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
   </resheader>
-  <data name="builtin_open_settings_subtitle" xml:space="preserve">
-    <value>Open Command Palette settings</value>
-  </data>
   <data name="builtin_new_extension_subtitle" xml:space="preserve">
-    <value>Creates a project for a new Command Palette extension</value>
+    <value>Generate a new Command Palette extension project</value>
   </data>
   <data name="builtin_quit_subtitle" xml:space="preserve">
     <value>Exit Command Palette</value>
@@ -157,10 +154,10 @@
     <value>Open</value>
   </data>
   <data name="builtin_create_extension_title" xml:space="preserve">
-    <value>Create a new extension</value>
+    <value>Create extension</value>
   </data>
   <data name="builtin_open_settings_name" xml:space="preserve">
-    <value>Open Settings</value>
+    <value>Open Command Palette settings</value>
   </data>
   <data name="builtin_create_extension_success" xml:space="preserve">
     <value>Successfully created your new extension!</value>