fix(i18n): add successful document restoration string

[juice49]

Description

There is no language string for the restore event, which causes the generic toast message to be rendered with a missing {{context}} value:

This change adds a dedicated string for successful document restoration:

What to review

• Is the string okay?

Testing

I don't believe we test document operation toasts at the moment, so it wouldn't make sense to implement just for document restoration.

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
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[github-actions]

No changes to documentation

[github-actions]

Component Testing Report Updated Feb 23, 2024 4:50 PM (UTC)

File	Status	Duration	Passed	Skipped	Failed
comments/CommentInput.spec.tsx	✅ Passed (Inspect)	32s	15	0	0
formBuilder/ArrayInput.spec.tsx	✅ Passed (Inspect)	6s	3	0	0
formBuilder/inputs/PortableText/Annotations.spec.tsx	❌ Failed (Inspect)	22s	0	0	3
formBuilder/inputs/PortableText/copyPaste/CopyPaste.spec.tsx	✅ Passed (Inspect)	13s	4	2	0
formBuilder/inputs/PortableText/Decorators.spec.tsx	✅ Passed (Inspect)	12s	6	0	0
formBuilder/inputs/PortableText/FocusTracking.spec.tsx	✅ Passed (Inspect)	32s	15	0	0
formBuilder/inputs/PortableText/Input.spec.tsx	✅ Passed (Inspect)	59s	15	0	0
formBuilder/inputs/PortableText/ObjectBlock.spec.tsx	✅ Passed (Inspect)	1m 1s	18	0	0
formBuilder/inputs/PortableText/Styles.spec.tsx	✅ Passed (Inspect)	12s	6	0	0
formBuilder/inputs/PortableText/Toolbar.spec.tsx	✅ Passed (Inspect)	19s	9	0	0