Unify search boxes (#29530)

Unify all but a few search boxes to use uniform style, uniform
translations and shared templates where possible.
Remove a few duplicated search templates, e. g. code search.

<details><summary>Example after screenshots:</summary>

![grafik](e20e7d6b-c6be-4a47-b132-672766f41421)

![grafik](d5b11b9c-c12f-4a29-8fb0-24e5aa511d18)

![grafik](d86bb444-36c7-426d-9cf1-c634963dffb1)

![grafik](a76c0319-0518-484a-a840-563d02b61198)

</details>

Also includes #29700

Co-authored-by: 6543 <6543@obermui.de>

---------

Co-authored-by: 6543 <m.huber@kithara.com>
Co-authored-by: 6543 <6543@obermui.de>
Co-authored-by: silverwind <me@silverwind.io>
Co-authored-by: Giteabot <teabot@gitea.io>
Conflicts:
	routers/web/repo/search.go
	templates/repo/home.tmpl
	templates/repo/search.tmpl
	templates/shared/repo_search.tmpl

templates/shared/search/code/results.tmpl

@@ -0,0 +1,36 @@
+<div class="flex-text-block gt-fw">
+	{{range $term := .SearchResultLanguages}}
+	<a class="ui {{if eq $.Language $term.Language}}primary{{end}} basic label gt-m-0"
+		href="{{$.Link}}?q={{$.Keyword}}{{if ne $.Language $term.Language}}&l={{$term.Language}}{{end}}&fuzzy={{$.IsFuzzy}}">
+		<i class="color-icon gt-mr-3" style="background-color: {{$term.Color}}"></i>
+		{{$term.Language}}
+		<div class="detail">{{$term.Count}}</div>
+	</a>
+	{{end}}
+</div>
+<div class="repository search">
+	{{range $result := .SearchResults}}
+		{{$repo := or $.Repo (index $.RepoMaps .RepoID)}}
+		<div class="diff-file-box diff-box file-content non-diff-file-content repo-search-result">
+			<h4 class="ui top attached normal header gt-df gt-fw">
+				{{if not $.Repo}}
+					<span class="file gt-f1">
+						<a rel="nofollow" href="{{$repo.Link}}">{{$repo.FullName}}</a>
+						{{if $repo.IsArchived}}
+							<span class="ui basic label">{{ctx.Locale.Tr "repo.desc.archived"}}</span>
+						{{end}}
+						- {{.Filename}}
+					</span>
+				{{else}}
+					<span class="file gt-f1">{{.Filename}}</span>
+				{{end}}
+				<a role="button" class="ui basic tiny button" rel="nofollow" href="{{$repo.Link}}/src/commit/{{$result.CommitID | PathEscape}}/{{.Filename | PathEscapeSegments}}">{{ctx.Locale.Tr "repo.diff.view_file"}}</a>
+			</h4>
+			<div class="ui attached table segment">
+				{{template "shared/searchfile" dict "RepoLink" $repo.Link "IsIndexer" true "SearchResult" .}}
+			</div>
+			{{template "shared/searchbottom" dict "root" $ "result" .}}
+		</div>
+	{{end}}
+</div>
+{{template "base/paginate" .}}

templates/shared/search/code/search.tmpl

@@ -0,0 +1,15 @@
+<form class="ui form ignore-dirty">
+	{{template "shared/search/combo_fuzzy" dict "Value" .Keyword "Disabled" .CodeIndexerUnavailable "IsFuzzy" .IsFuzzy "Placeholder" (ctx.Locale.Tr "search.code_kind")}}
+</form>
+<div class="divider"></div>
+<div class="ui user list">
+	{{if .CodeIndexerUnavailable}}
+		<div class="ui error message">
+			<p>{{ctx.Locale.Tr "search.code_search_unavailable"}}</p>
+		</div>
+	{{else if .SearchResults}}
+		{{template "shared/search/code/results" .}}
+	{{else if .Keyword}}
+		<div>{{ctx.Locale.Tr "search.no_results"}}</div>
+	{{end}}
+</div>