Make wallet import error more user friendly

[generalpiston]

Description

When importing seed words that aren't in a dictionary, we get a not-very user friendly error.

Reproduction Steps (If Bug)

1. Go to Settings > Destroy Wallet
2. Import the following seed: horror legend check ticket hold napkin brave monitor public social phrase alreadys

[gitcoinbot]

Issue Status: 1. Open 2. Started 3. Submitted 4. Done

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[gitcoinbot]

Issue Status: 1. Open 2. Started 3. Submitted 4. Done

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Work has been started.

These users each claimed they can complete the work by 12 months from now.
Please review their action plans below:

1) lorinczf has started work.

Calm your gift my bonus is alredy win

Learn more on the Gitcoin Issue Details page.

[generalpiston]

@LorinczF thanks for helping out on this issue. Let me know if you have any questions.

[gitcoinbot]

Issue Status: 1. Open 2. Started 3. Submitted 4. Done

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Work has been started.

These users each claimed they can complete the work by 11 months, 3 weeks from now.
Please review their action plans below:

1) lorinczf has started work.

Come on cash now yupeee.lets go now

Learn more on the Gitcoin Issue Details page.

[Veiviser]

Hey. Just getting into programming here, but this looks like something I might be able to work on. What specifically do you want done?

Just a visual update on the error?

[generalpiston]

The error message should be changed. Maybe Provided keywords are invalid.