Align language menu icon and fit the footer area (#25556) (#25563)

Backport #25556 by @wxiaoguang

Close #25551

## Before


![image](https://github.com/go-gitea/gitea/assets/2114189/f35aebeb-9c86-4632-8c1f-1c90aa757640)

## After



![image](https://github.com/go-gitea/gitea/assets/2114189/4a623687-6c6d-442a-a4f9-07dadeb9fc6d)


----


![image](https://github.com/go-gitea/gitea/assets/2114189/6a4e5ecf-b88b-4c22-98c3-21898bd41bc5)

Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

Author: GiteaBot

templates/base/footer_content.tmpl

@@ -16,7 +16,7 @@
 	</div>
 	<div class="right-links" role="group" aria-label="{{.locale.Tr "aria.footer.links"}}">
 		<div class="ui dropdown upward language">
-			<span>{{svg "octicon-globe"}} {{.locale.LangName}}</span>
+			<span class="flex-text-inline">{{svg "octicon-globe" 14}} {{.locale.LangName}}</span>
 			<div class="menu language-menu">
 				{{range .AllLangs}}
 					<a lang="{{.Lang}}" data-url="{{AppSubUrl}}/?lang={{.Lang}}" class="item {{if eq $.locale.Lang .Lang}}active selected{{end}}">{{.Name}}</a>

web_src/css/home.css

@@ -45,18 +45,26 @@
 
 .page-footer {
   display: flex;
+  justify-content: space-between;
   background-color: var(--color-footer);
   border-top: 1px solid var(--color-secondary);
-  line-height: 39px;
-  padding: 0 20px;
+  padding: 8px 20px;
 }
 
 .page-footer .left-links {
-  flex: 1;
+  display: flex;
+  flex-wrap: wrap;
+  align-items: center;
+  justify-content: center;
+  gap: 0.25em;
 }
 
 .page-footer .right-links {
   min-width: 180px; /* make sure the menu dropdown doesn't overflow horizontally when language name is short */
+  display: flex;
+  flex-wrap: wrap;
+  align-items: center;
+  justify-content: center;
 }
 
 .page-footer .right-links > a {
@@ -74,7 +82,7 @@
 
 @media (max-width: 880px) {
   .page-footer {
-    display: block;
-    text-align: center;
+    flex-direction: column;
+    gap: 0.5em;
   }
 }