Refactor page titles and subtitles for consistency and clarity across various PDF conversion tools

src/pages/invert-colors.html

@@ -120,11 +120,10 @@
           class="text-2xl font-bold text-white mb-2"
           data-i18n="tools:invertColors.name"
         >
-          Invert Colors Free Online - Fast & Secure
+          Invert Colors
         </h1>
         <p class="text-gray-400 mb-6" data-i18n="tools:invertColors.subtitle">
-          Invert all colors in your PDF document, creating a negative image
-          effect.
+          Create a "dark mode" version of your PDF.
         </p>
 
         <div