Added fixed height for card chain blocks and card chain transactions.

[YegorSan]

This PR is related to #2675 issue.

Motivation

Fixed height for card chain blocks and card chain transactions requested.

Changelog

Enhancements

Added fixed height for card chain blocks and transactions.

Checklist for your PR

• I added an entry to CHANGELOG.md with this PR
• If I added new functionality, I added tests covering it.
• If I fixed a bug, I added a regression test to prevent the bug from silently reappearing again.
• I checked whether I should update the docs and did so if necessary
• If I added/changed/removed ENV var, I should update the list of env vars in https://github.com/poanetwork/blockscout/blob/master/docs/env-variables.md to reflect changes in the table here https://poanetwork.github.io/blockscout/#/env-variables?id=blockscout-env-variables. I've set master in the Version column.
• If I add new indices into DB, I checked, that they don't redundant with PGHero or other tools

[vbaranov]

@YegorSan @pashagonchar

I have to reject 👇

[YegorSan]

@vbaranov Hello Victor. I've created new loaders for block chain container:
Light mode:

Dark mode:

Added two more loaders to transactions container:

Fixed issue with height (added fixed min height and auto max height).

Please review. Thank's in advance.

[YegorSan]

@vbaranov I also have a question regarding gettext issue. Each time I pushing new commit, issue is appearing. First commit - everything is ok, but next one already coming with gettext issue. I know that fix for that issue is pretty simple, but maybe you tell me what can be a reason of such situation, and possibly I can prevent it for future. Thank you.

[vbaranov]

@YegorSan every time you adding/removing lines in the Elixir templates you need to change the number of line for the localization string in the internationalization files. This is why with every change you need to run https://poanetwork.github.io/blockscout/#/internationalization?id=internationalization. Please fix gettext issue. PR looks good.

[YegorSan]

@vbaranov Ok. Thank you so much for information Victor. I've just wondered if I am doing something wrong. Will fix gettext issue , and push update shortly.

[YegorSan]

@vbaranov Re-added internationalization.