Fix incorrect tailwind migration (#30007)

Fixes https://github.com/go-gitea/gitea/issues/30005. Regression from
https://github.com/go-gitea/gitea/pull/29945.

There was only once instance of `tw-content-center` before that PR, so I
just ran below command and reverted that one instance.

```sh
perl -p -i -e 's#tw-content-center#tw-items-center#g' web_src/js/**/* templates/**/* models/**/* tests/**/*
```

4 files changed, 18 insertions, 18 deletions

diff --git a/templates/repo/diff/box.tmpl b/templates/repo/diff/box.tmpl
index d71ad1b2ad..42eaf9d30e 100644
--- a/templates/repo/diff/box.tmpl
+++ b/templates/repo/diff/box.tmpl
@@ -1,7 +1,7 @@
 {{$showFileTree := (and (not .DiffNotAvailable) (gt .Diff.NumFiles 1))}}
 <div>
 	<div class="diff-detail-box diff-box">
-		<div class="tw-flex tw-content-center tw-flex-wrap gt-gap-3 gt-ml-1">
+		<div class="tw-flex tw-items-center tw-flex-wrap gt-gap-3 gt-ml-1">
 			{{if $showFileTree}}
 				<button class="diff-toggle-file-tree-button not-mobile btn interact-fg" data-show-text="{{ctx.Locale.Tr "repo.diff.show_file_tree"}}" data-hide-text="{{ctx.Locale.Tr "repo.diff.hide_file_tree"}}">
 					{{/* the icon meaning is reversed here, "octicon-sidebar-collapse" means show the file tree */}}
@@ -18,14 +18,14 @@
 				</script>
 			{{end}}
 			{{if not .DiffNotAvailable}}
-				<div class="diff-detail-stats tw-flex tw-content-center tw-flex-wrap">
+				<div class="diff-detail-stats tw-flex tw-items-center tw-flex-wrap">
 					{{svg "octicon-diff" 16 "gt-mr-2"}}{{ctx.Locale.Tr "repo.diff.stats_desc" .Diff.NumFiles .Diff.TotalAddition .Diff.TotalDeletion}}
 				</div>
 			{{end}}
 		</div>
 		<div class="diff-detail-actions">
 			{{if and .PageIsPullFiles $.SignedUserID (not .IsArchived) (not .DiffNotAvailable)}}
-				<div class="not-mobile tw-flex tw-content-center tw-flex-col tw-whitespace-nowrap gt-mr-2">
+				<div class="not-mobile tw-flex tw-items-center tw-flex-col tw-whitespace-nowrap gt-mr-2">
 					<label for="viewed-files-summary" id="viewed-files-summary-label" data-text-changed-template="{{ctx.Locale.Tr "repo.pulls.viewed_files_label"}}">
 						{{ctx.Locale.Tr "repo.pulls.viewed_files_label" .Diff.NumViewedFiles .Diff.NumFiles}}
 					</label>
@@ -110,8 +110,8 @@
 					{{$isExpandable := or (gt $file.Addition 0) (gt $file.Deletion 0) $file.IsBin}}
 					{{$isReviewFile := and $.IsSigned $.PageIsPullFiles (not $.IsArchived) $.IsShowingAllCommits}}
 					<div class="diff-file-box diff-box file-content {{TabSizeClass $.Editorconfig $file.Name}} gt-mt-0" id="diff-{{$file.NameHash}}" data-old-filename="{{$file.OldName}}" data-new-filename="{{$file.Name}}" {{if or ($file.ShouldBeHidden) (not $isExpandable)}}data-folded="true"{{end}}>
-						<h4 class="diff-file-header sticky-2nd-row ui top attached normal header tw-flex tw-content-center tw-justify-between tw-flex-wrap">
-							<div class="diff-file-name tw-flex tw-content-center gt-gap-2 tw-flex-wrap">
+						<h4 class="diff-file-header sticky-2nd-row ui top attached normal header tw-flex tw-items-center tw-justify-between tw-flex-wrap">
+							<div class="diff-file-name tw-flex tw-items-center gt-gap-2 tw-flex-wrap">
 								<button class="fold-file btn interact-bg gt-p-2{{if not $isExpandable}} tw-invisible{{end}}">
 									{{if $file.ShouldBeHidden}}
 										{{svg "octicon-chevron-right" 18}}
@@ -119,7 +119,7 @@
 										{{svg "octicon-chevron-down" 18}}
 									{{end}}
 								</button>
-								<div class="gt-font-semibold tw-flex tw-content-center gt-mono">
+								<div class="gt-font-semibold tw-flex tw-items-center gt-mono">
 									{{if $file.IsBin}}
 										<span class="gt-ml-1 gt-mr-3">
 											{{ctx.Locale.Tr "repo.diff.bin"}}
@@ -144,7 +144,7 @@
 									<span class="gt-ml-4 gt-mono">{{ctx.Locale.Tr ($file.ModeTranslationKey $file.Mode)}}</span>
 								{{end}}
 							</div>
-							<div class="diff-file-header-actions tw-flex tw-content-center gt-gap-2 tw-flex-wrap">
+							<div class="diff-file-header-actions tw-flex tw-items-center gt-gap-2 tw-flex-wrap">
 								{{if $showFileViewToggle}}
 									<div class="ui compact icon buttons">
 										<button class="ui tiny basic button file-view-toggle" data-toggle-selector="#diff-source-{{$file.NameHash}}" data-tooltip-content="{{ctx.Locale.Tr "repo.file_view_source"}}">{{svg "octicon-code"}}</button>
@@ -218,7 +218,7 @@
 
 				{{if .Diff.IsIncomplete}}
 					<div class="diff-file-box diff-box file-content gt-mt-3" id="diff-incomplete">
-						<h4 class="ui top attached normal header tw-flex tw-content-center tw-justify-between">
+						<h4 class="ui top attached normal header tw-flex tw-items-center tw-justify-between">
 							{{ctx.Locale.Tr "repo.diff.too_many_files"}}
 							<a class="ui basic tiny button" id="diff-show-more-files" data-href="?skip-to={{.Diff.End}}&file-only=true">{{ctx.Locale.Tr "repo.diff.show_more"}}</a>
 						</h4>
diff --git a/templates/repo/diff/comments.tmpl b/templates/repo/diff/comments.tmpl
index aed01ef5fb..4b626ba2b0 100644
--- a/templates/repo/diff/comments.tmpl
+++ b/templates/repo/diff/comments.tmpl
@@ -8,8 +8,8 @@
 		{{template "shared/user/avatarlink" dict "user" .Poster}}
 	{{end}}
 	<div class="content comment-container">
-		<div class="ui top attached header comment-header tw-flex tw-content-center tw-justify-between">
-			<div class="comment-header-left tw-flex tw-content-center">
+		<div class="ui top attached header comment-header tw-flex tw-items-center tw-justify-between">
+			<div class="comment-header-left tw-flex tw-items-center">
 				{{if .OriginalAuthor}}
 					<span class="text black gt-font-semibold gt-mr-2">
 						{{svg (MigrationIcon $.root.Repository.GetOriginalURLHostname)}}
@@ -30,7 +30,7 @@
 					</span>
 				{{end}}
 			</div>
-			<div class="comment-header-right actions tw-flex tw-content-center">
+			<div class="comment-header-right actions tw-flex tw-items-center">
 				{{if .Invalidated}}
 					{{$referenceUrl := printf "%s#%s" $.root.Issue.Link .HashTag}}
 					<a href="{{$referenceUrl}}" class="ui label basic small" data-tooltip-content="{{ctx.Locale.Tr "repo.issues.review.outdated_description"}}">
diff --git a/templates/repo/diff/conversation.tmpl b/templates/repo/diff/conversation.tmpl
index 1bc018e8e2..85bfe4923a 100644
--- a/templates/repo/diff/conversation.tmpl
+++ b/templates/repo/diff/conversation.tmpl
@@ -8,8 +8,8 @@
 	{{$referenceUrl := printf "%s#%s" $.Issue.Link $comment.HashTag}}
 	<div class="conversation-holder" data-path="{{$comment.TreePath}}" data-side="{{if lt $comment.Line 0}}left{{else}}right{{end}}" data-idx="{{$comment.UnsignedLine}}">
 		{{if $resolved}}
-			<div class="ui attached header resolved-placeholder tw-flex tw-content-center tw-justify-between">
-				<div class="ui grey text tw-flex tw-content-center tw-flex-wrap gt-gap-2">
+			<div class="ui attached header resolved-placeholder tw-flex tw-items-center tw-justify-between">
+				<div class="ui grey text tw-flex tw-items-center tw-flex-wrap gt-gap-2">
 					{{svg "octicon-check" 16 "icon gt-mr-2"}}
 					<b>{{$resolveDoer.Name}}</b> {{ctx.Locale.Tr "repo.issues.review.resolved_by"}}
 					{{if $invalid}}
@@ -22,12 +22,12 @@
 						</a>
 					{{end}}
 				</div>
-				<div class="tw-flex tw-content-center gt-gap-3">
-					<button id="show-outdated-{{$comment.ID}}" data-comment="{{$comment.ID}}" class="ui tiny labeled button show-outdated tw-flex tw-content-center">
+				<div class="tw-flex tw-items-center gt-gap-3">
+					<button id="show-outdated-{{$comment.ID}}" data-comment="{{$comment.ID}}" class="ui tiny labeled button show-outdated tw-flex tw-items-center">
 						{{svg "octicon-unfold" 16 "gt-mr-3"}}
 						{{ctx.Locale.Tr "repo.issues.review.show_resolved"}}
 					</button>
-					<button id="hide-outdated-{{$comment.ID}}" data-comment="{{$comment.ID}}" class="ui tiny labeled button hide-outdated tw-flex tw-content-center gt-hidden">
+					<button id="hide-outdated-{{$comment.ID}}" data-comment="{{$comment.ID}}" class="ui tiny labeled button hide-outdated tw-flex tw-items-center gt-hidden">
 						{{svg "octicon-fold" 16 "gt-mr-3"}}
 						{{ctx.Locale.Tr "repo.issues.review.hide_resolved"}}
 					</button>
@@ -40,7 +40,7 @@
 					{{template "repo/diff/comments" dict "root" $ "comments" .comments}}
 				</ui>
 			</div>
-			<div class="tw-flex tw-justify-end tw-content-center tw-flex-wrap gt-mt-3">
+			<div class="tw-flex tw-justify-end tw-items-center tw-flex-wrap gt-mt-3">
 				<div class="ui buttons gt-mr-2">
 					<button class="ui icon tiny basic button previous-conversation">
 						{{svg "octicon-arrow-up" 12 "icon"}} {{ctx.Locale.Tr "repo.issues.previous"}}
diff --git a/templates/repo/diff/new_review.tmpl b/templates/repo/diff/new_review.tmpl
index 9d1eef712d..9c824db0ad 100644
--- a/templates/repo/diff/new_review.tmpl
+++ b/templates/repo/diff/new_review.tmpl
@@ -10,7 +10,7 @@
 			<form class="ui form form-fetch-action" action="{{.Link}}/reviews/submit" method="post">
 				{{.CsrfTokenHtml}}
 				<input type="hidden" name="commit_id" value="{{.AfterCommitID}}">
-				<div class="field tw-flex tw-content-center">
+				<div class="field tw-flex tw-items-center">
 					<div class="tw-flex-1">{{ctx.Locale.Tr "repo.diff.review.header"}}</div>
 					<a class="muted close">{{svg "octicon-x" 16}}</a>
 				</div>