fixes before release v10.1.0

[Murazaki]

Description

Related issues

Should fix #401

• dynamic tables: give the focus to first input when adding a row
• fix npm run lint so it can handle lit linting errors
• fix lit linting errors
• dynamic table: add titles to "+" and "-" buttons
• dynamic table: add confirmation when deleting a line
• channel configuration: add a cancel button that reload data from backend
• channel emojis: add a cancel button
• in channel-detail, channel-configuration, ... there are some public attributes prefixed by _, and some private attributes without the prefix. Clean that.
• _asyncTaskRender: handle error (and pending?) case (this method exists in several elements)
• check that there is no missing localization for error messages (no hard coded labels)
• dynamic tables: column description on thead title attribute is not very accessible (does not work on mobile, is not easy to find if user don't know it exists)
• channel configuration: table too large?

Mandatory Checks

• I have added a description of the changes in the CHANGELOG files
• I have run npm run lint to check that my changes respects the coding conventions
• I have added user documentation for the new features I added
• I have added technical documentation for the new features I added
• I added some documentation and I have run npm run doc:translate to generate translations files

Screenshots