Fix various trivial frontend problems (#34263)

1. Fix #20606
2. Fix #34246
3. Fix missing spaces, fix misspells, no visual change.
4. Fix missing "not-mobile", fix #34265

---------

Co-authored-by: silverwind <me@silverwind.io>

templates/repo/issue/labels/label_edit_modal.tmpl

@@ -50,7 +50,7 @@
 			<div class="field">
 				<label for="color">{{ctx.Locale.Tr "repo.issues.label_color"}}</label>
 				<div class="column js-color-picker-input">
-					<input name="color" value="#70c24a"placeholder="#c320f6" required maxlength="7">
+					<input name="color" value="#70c24a" placeholder="#c320f6" required maxlength="7">
 					{{template "repo/issue/label_precolors"}}
 				</div>
 			</div>

templates/repo/issue/milestone_issues.tmpl

@@ -28,8 +28,8 @@
 		{{end}}
 		<div class="tw-flex tw-flex-col tw-gap-2">
 			<progress class="milestone-progress-big" value="{{.Milestone.Completeness}}" max="100"></progress>
-			<div class="tw-flex tw-gap-4">
-				<div classs="tw-flex tw-items-center">
+			<div class="flex-text-block tw-gap-4">
+				<div class="flex-text-inline">
 					{{$closedDate:= DateUtils.TimeSince .Milestone.ClosedDateUnix}}
 					{{if .IsClosed}}
 						{{svg "octicon-clock"}} {{ctx.Locale.Tr "repo.milestones.closed" $closedDate}}
@@ -46,7 +46,7 @@
 						{{end}}
 					{{end}}
 				</div>
-				<div class="tw-mr-2">{{ctx.Locale.Tr "repo.milestones.completeness" .Milestone.Completeness}}</div>
+				<div>{{ctx.Locale.Tr "repo.milestones.completeness" .Milestone.Completeness}}</div>
 				{{if .TotalTrackedTime}}
 					<div data-tooltip-content='{{ctx.Locale.Tr "tracked_time_summary"}}'>
 						{{svg "octicon-clock"}}

templates/repo/issue/view_content/comments.tmpl

@@ -615,7 +615,7 @@
 			<div class="timeline-item-group">
 				<div class="timeline-item event" id="{{.HashTag}}">
 					<a class="timeline-avatar"{{if gt .Poster.ID 0}} href="{{.Poster.HomeLink}}"{{end}}>
-						<img src="{{.Poster.AvatarLink ctx}}" width="40" height="40">
+						<img alt src="{{.Poster.AvatarLink ctx}}" width="40" height="40">
 					</a>
 					<span class="badge grey">{{svg "octicon-x" 16}}</span>
 					<span class="text grey muted-links">