Invert colors (#4498)

frontend/public/locales/en-GB/translation.json

@@ -619,8 +619,7 @@
       "title": "Auto Split by Size/Count",
       "desc": "Automatically split PDFs by file size or page count"
     },
-    "replaceColorPdf": {
-      "tags": "color,replace,invert",
+    "replaceColor": {
       "title": "Replace & Invert Colour",
       "desc": "Replace or invert colours in PDF documents"
     },
@@ -2533,25 +2532,48 @@
     },
     "selectCustomCert": "Custom Certificate File X.509 (Optional)"
   },
-  "replace-color": {
-    "title": "Advanced Colour options",
-    "header": "Replace-Invert Colour PDF",
-    "selectText": {
-      "1": "Replace or Invert colour Options",
-      "2": "Default(Default high contrast colours)",
-      "3": "Custom(Customised colours)",
-      "4": "Full-Invert(Invert all colours)",
-      "5": "High contrast colour options",
-      "6": "white text on black background",
-      "7": "Black text on white background",
-      "8": "Yellow text on black background",
-      "9": "Green text on black background",
-      "10": "Choose text Colour",
-      "11": "Choose background Colour"
+  "replaceColor": {
+    "labels": {
+      "settings": "Settings",
+      "colourOperation": "Colour operation"
     },
-    "submit": "Replace"
+    "options": {
+      "highContrast": "High contrast",
+      "invertAll": "Invert all colours",
+      "custom": "Custom"
+    },
+    "tooltip": {
+      "header": {
+        "title": "Replace & Invert Colour Settings Overview"
+      },
+      "description": {
+        "title": "Description",
+        "text": "Transform PDF colours to improve readability and accessibility. Choose from high contrast presets, invert all colours, or create custom colour schemes."
+      },
+      "highContrast": {
+        "title": "High Contrast",
+        "text": "Apply predefined high contrast colour combinations designed for better readability and accessibility compliance.",
+        "bullet1": "White text on black background - Classic dark mode",
+        "bullet2": "Black text on white background - Standard high contrast",
+        "bullet3": "Yellow text on black background - High visibility option",
+        "bullet4": "Green text on black background - Alternative high contrast"
+      },
+      "invertAll": {
+        "title": "Invert All Colours",
+        "text": "Completely invert all colours in the PDF, creating a negative-like effect. Useful for creating dark mode versions of documents or reducing eye strain in low-light conditions."
+      },
+      "custom": {
+        "title": "Custom Colours",
+        "text": "Define your own text and background colours using the colour pickers. Perfect for creating branded documents or specific accessibility requirements.",
+        "bullet1": "Text colour - Choose the colour for text elements",
+        "bullet2": "Background colour - Set the background colour for the document"
+      }
+    },
+    "error": {
+      "failed": "An error occurred while processing the colour replacement."
+    }
   },
-  "replaceColorPdf": {
+  "replaceColor": {
     "tags": "Replace Colour,Page operations,Back end,server side"
   },
   "login": {