Change PP header to avoid confusion

It previously look like:
Q: Wha tuser information does Psiphon collect?
A: User Activity and VPN Data

...which was really not the intention. Now it uses a more generic, non-question heading.

Author: adam-p

_locales/en/messages.json

@@ -1111,12 +1111,12 @@
     "description": "A bullet list item following from 'This will happen for two reasons:'"
   },
   "faq-information-collected-question": {
-    "message": "What user information does Psiphon collect?",
+    "message": "Data Categories",
     "description": "Heading for a section in our privacy policy."
   },
   "privacy-information-collected-client-ads-head": {
     "message": "Psiphon Client Advertising Networks",
-    "description": "Sub-heading on the Privacy Policy page above the info about what user information is collected by the ads shown in the Psiphon client software"
+    "description": "Sub-heading on the Privacy Policy page above the info about what data categories are collected by the ads shown in the Psiphon client software"
   },
   "privacy-information-collected-client-advertising-networks-para-1": {
     "message": "We sometimes use advertisements to support our service, which may use technology such as cookies and web beacons. Our advertising partners' use of cookies enable them and their partners to serve ads based on your usage data. Any information collected through this process is handled under the terms of our advertising partners' privacy policies:"
@@ -1126,7 +1126,7 @@
   },
   "privacy-information-collected-websites-head": {
     "message": "Psiphon Websites",
-    "description": "Sub-heading on the Privacy Policy page above the info about what user information is collected by the Psiphon websites"
+    "description": "Sub-heading on the Privacy Policy page above the info about what data categories are collected by the Psiphon websites"
   },
   "privacy-information-collected-websites-google-analytics-head": {
     "message": "Google Analytics",