support system.remark on account manage page

[brenzi]

motivation:

We've been discussing benefits on other, possibly non-substrate networks. DASH is offering a budget to distribute among reputables similar to the KSM faucet.

What we need to make this happen is an authenticated link to a DASH wallet address. system.remark is the lowest hanging fruit to link an Encointer account to a DAH wacount with public auditability of the distribution process

• let accountManage page scroll. it overflows on small screens
• add all translations
• limit length of note: frame-system pallet has no limit on a remark!
• notification about tx status success or error this is a bug unrelated to this PR

[brenzi]

first test successful:
https://polkadot.js.org/apps/?rpc=wss%3A%2F%2Fgesell.encointer.org#/explorer/query/0x89044aaf2a85289dfdb52baa67285c0c901cd85f4f811e97cf9b681120636520

[brenzi]

remark events aren't displayed by js/apps by default. need to scan the blocks:

[brenzi]

here the entire flow of the first use case: linking a DASH account

video: https://github.com/user-attachments/assets/27dda403-5d76-4cdd-a68c-0fa262122172

[clangenb]

The code looks good to me and I tested it. Two notes:

• it is a bit sad that system remarks doesn't emit an event on the chain, but I guess we can't change that.
• There is no feedback of success if you send a node.