form table.list td .truncate {
display: block;
max-width: 100% !important;
white-space: nowrap;
overflow: hidden;
}
form table.list td .truncate:not(.bleed) {
text-overflow: ellipsis;
}

One heads-up: this applies to every column you've set to Clip or Ellipsis (including Subject), not just "Issue summary". There's no reliable way to target a single custom column, since columns can be reordered. And on narrow screens it'll cut text more aggressively. If that tradeoff works for your data-heavy view, it should do the job.

The color-block priority column only shows up when that column's name is the English word "Priority". On a German install the column is named "Priorität", so osTicket Awesome doesn't recognize it and falls back to plain text. That's what Detlev is seeing. The same issue exists in any language that isn't English.

Workaround (thanks chrswsmn): edit the queue column and set its name to "Priority" (English). Go to Admin Panel → Manage → Ticket Queues, open the queue, select the Priority column, and set the name to "Priority". The color blocks and icon header come back.

We've now fixed this properly and it will be included in the next release (osTicket-1.18.3-Awesome-107). I will post an update here when that is available.

The Name of the Datasource for the Column Priority is expected to be in english.

I slightly edited your fix:

#list-items i.icon-edit {
    margin: -5px 5px 0 22px !important;
}