Rephrase empty placeholder in clear database (#8082)

Co-authored-by: nicki <[email protected]>

Co-authored-by: nicki <[email protected]>

i18n/src/main/res/values/strings.xml

@@ -500,7 +500,7 @@
     <string name="clear_database_source_item_count">%1$d non-library manga in database</string>
     <string name="clear_database_confirmation">Are you sure? Read chapters and progress of non-library manga will be lost</string>
     <string name="clear_database_completed">Entries deleted</string>
-    <string name="database_clean">Database clean</string>
+    <string name="database_clean">Nothing to clear</string>
     <string name="pref_clear_webview_data">Clear WebView data</string>
     <string name="webview_data_deleted">WebView data cleared</string>
     <string name="pref_refresh_library_covers">Refresh library covers</string>