Revert "Add a margin to plugin cards to allow menu space."

This reverts commit 79bdc174857a04bcddf2fae9fc55b7d2d3528b9f.
Fixed margin bleed in plugin cards.
Fixed broken toast for Clear All User Metadata.
Fix long tooltip causing horizontal scroll bars.

Use a shorter tooltip, and just cut off anything that extends beyond the
content area.
Add top and bottom margins to sidebar plugin list.

Following Material Design spec.
Fix main menu item truncation on very short windows.
Create space for the last card's menu on open.
Improve menu top/bottom padding styling.

The override isn't actually necessary if the padding is applied as a
margin to the first and last items.
Add halign attribute passthrough to loot-dropdown-menu.
Fixed message row language menu alignment.