feat: Support bigger font size in dashboard (#10974)

# Pull Request Template

## Description

Fixes
https://linear.app/chatwoot/issue/CW-4091/accessibility-improvement-support-bigger-font-size-for-the-dashboard

## Type of change

- [x] New feature (non-breaking change which adds functionality)

## How Has This Been Tested?

### **Loom video**

https://www.loom.com/share/1ab781859fa748a5ad54aacbacd127b4?sid=a7dd9164-a6de-462f-bff7-1b25e9c55b4f

## Checklist:

- [x] My code follows the style guidelines of this project
- [x] I have performed a self-review of my code
- [x] I have commented on my code, particularly in hard-to-understand
areas
- [ ] I have made corresponding changes to the documentation
- [x] My changes generate no new warnings
- [x] I have added tests that prove my fix is effective or that my
feature works
- [x] New and existing unit tests pass locally with my changes
- [ ] Any dependent changes have been merged and published in downstream
modules

app/javascript/dashboard/i18n/locale/en/settings.json

@@ -35,6 +35,24 @@
           }
         }
       },
+      "INTERFACE_SECTION": {
+        "TITLE": "Interface",
+        "NOTE": "Customize the look and feel of your Chatwoot dashboard.",
+        "FONT_SIZE": {
+          "TITLE": "Font size",
+          "NOTE": "Adjust the text size across the dashboard based on your preference.",
+          "UPDATE_SUCCESS": "Your font settings have been updated successfully",
+          "UPDATE_ERROR": "There is an error while updating the font settings, please try again",
+          "OPTIONS": {
+            "SMALLER": "Smaller",
+            "SMALL": "Small",
+            "DEFAULT": "Default",
+            "LARGE": "Large",
+            "LARGER": "Larger",
+            "EXTRA_LARGE": "Extra Large"
+          }
+        }
+      },
       "MESSAGE_SIGNATURE_SECTION": {
         "TITLE": "Personal message signature",
         "NOTE": "Create a unique message signature to appear at the end of every message you send from any inbox. You can also include an inline image, which is supported in live-chat, email, and API inboxes.",