Update list group headers styling

src/screens/Extensions.tsx

@@ -285,7 +285,7 @@ export function Extensions({ tabsMenuHeight }: { tabsMenuHeight: number }) {
                     const [groupName] = filteredGroupedExtensions[index];
 
                     return (
-                        <StyledGroupHeader key={groupName} variant="h4" isFirstItem={index === 0}>
+                        <StyledGroupHeader key={groupName} variant="h5" component="h2" isFirstItem={index === 0}>
                             {translateExtensionLanguage(groupName)}
                         </StyledGroupHeader>
                     );

src/screens/Sources.tsx

@@ -140,11 +140,12 @@ export function Sources() {
                             <Fragment key={lang}>
                                 <Typography
                                     key={lang}
-                                    variant="h4"
-                                    style={{
-                                        paddingLeft: '24px',
-                                        paddingTop: '6px',
-                                        paddingBottom: '16px',
+                                    variant="h5"
+                                    component="h2"
+                                    sx={{
+                                        paddingLeft: 3,
+                                        paddingTop: 1,
+                                        paddingBottom: 2,
                                         fontWeight: 'bold',
                                     }}
                                 >

src/screens/Updates.tsx

@@ -156,7 +156,7 @@ export const Updates: React.FC = () => {
                 endReached={loadMore}
                 groupCounts={groupCounts}
                 groupContent={(index) => (
-                    <StyledGroupHeader variant="h5" isFirstItem={index === 0}>
+                    <StyledGroupHeader variant="h5" component="h2" isFirstItem={index === 0}>
                         {groupedUpdates[index][0]}
                     </StyledGroupHeader>
                 )}