Make strings on `Duplicati/Library/Main/Utility.cs` translatable

[luixxiul]

• [x] I have searched open and closed issues for duplicates.
• [ ] I have searched the forum for related topics.

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Environment info

• Duplicati version: Debug
• Operating system: irrelevant
• Backend: irrelevant

Description

The strings here of Duplicati/Library/Main/Utility.cs cannot be displayed in other languages than English.

In my opinion, they should be able to be translated because they are error messages and require user's attention.

Steps to reproduce

1. Set the UI language into something other than English
2. Create a backup task without providing an encryption passphrase
3. Run the task
4. Set a passphrase to the task
5. Run the task against the warning anyway
6. Make sure the error message is displayed

• Actual result: the error message is displayed in English.

• Expected result: it should be able to be translated.

Screenshots

Debug log