Harmonize buttons and icons on the update page

[Salvialf]

• Groups changelog / check / update / reinstall / remove buttons into a single rounded button group in each update table row.
• Replaces inconsistent icons with a coherent set: fa-check for verify, fa-sync-alt for update, fa-redo-alt for reinstall, fa-file-code for changelog, fa-lock for the "don't update this plugin" toggle.
• Simplifies the changelog link logic (single pluginChangelog variable instead of duplicated beta/stable branches).
• Wraps the "don't update" checkbox and its icon in a single <label> with one unified tooltip, instead of two separate tooltips and an empty, unused label.
• Adjusts the update table row layout (flex) so rows fit evenly on the page instead of leaving uneven gaps, especially in mobile/reflow view.
• Guards the "don't update" checkbox tooltip flash behind event.isTrusted, so a future fix to the checkbox context menu (bulk select/deselect) won't flash every row's tooltip at once.
• Fixes minor wording issues in confirmation and alert messages (accents, phrasing).

Based on a community suggestion: https://community.jeedom.com/t/suggestion-de-presentation-sur-la-page-mise-a-jour/149869