[PM-13776] Generator Icon Button labels (#11623)

* update aria labels for generate and copy buttons within the generator components

- Using the `appA11yTitle` across all icon buttons
- Updated all labels to be targeted towards the credential type rather than just "password"

* add copy/generate passphrase translations to desktop

* add fixme comments for translations

* remove reference to JIRA ticket

apps/browser/src/_locales/en/messages.json

@@ -107,6 +107,9 @@
   "copyPassword": {
     "message": "Copy password"
   },
+  "copyPassphrase": {
+    "message": "Copy passphrase"
+  },
   "copyNote": {
     "message": "Copy note"
   },
@@ -407,6 +410,9 @@
   "generatePassword": {
     "message": "Generate password"
   },
+  "generatePassphrase": {
+    "message": "Generate passphrase"
+  },
   "regeneratePassword": {
     "message": "Regenerate password"
   },