GUI allows to specify invalid era period

[Moliholy]

• I'm submitting a ...

• Bug report
• Feature request
• Support request
• Other

• What is the current behavior and expected behavior?

Currently the GUI allows to specify any arbitrary number for the era when signing an extrinsic. However, the maximum period is defined in the runtime, and it is usually 4096 blocks.

• What is the motivation for changing the behavior?

This can lead users to sign extrinsics with an era that will yield an InValidSignature error, which is not intuitive. At least a warning should be shown to notify the user of this possible behaviour.

[polkadot-js-bot]

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