feat(DEV-11417): recurring invoice refinements 💅

[radist2s]

This PR makes minor text updates for the recurring invoice feature:

• Changed "Set up" to "Convert"
• Updated text in the invoice recurrence form
• Refined text in the recurrence invoice cancel modal

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: fac2f27cff343f22d9ba41fc3be93491880640f7

The changes in this PR will be included in the next version bump.

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