🌐 Complete missing English translations for social platforms and website references

- Added missing English translation strings for "Matrix", "SimpleX", "Telegram", "Twitter", and "Website" keys in `lang/en.json`.

lang/en.json

@@ -242,7 +242,7 @@
     "Längengrad": "Longitude",
     "Manage your profile and account settings": "Manage your profile and account settings",
     "Manage your two-factor authentication settings": "Manage your two-factor authentication settings",
-    "Matrix": "",
+    "Matrix": "Matrix",
     "Matrix Gruppe": "Matrix Group",
     "Matrix-Raum Bezeichner oder Link": "Matrix room identifier or link",
     "Meetup aktualisieren": "Update meetup",
@@ -333,7 +333,7 @@
     "Signal": "Signal",
     "Signal Kontakt- oder Gruppeninformationen": "Signal contact or group information",
     "SimpleX": "SimpleX",
-    "Simplex": "",
+    "Simplex": "Simplex",
     "SimpleX Chat Kontaktinformationen": "SimpleX Chat contact information",
     "Soll dieses Meetup auf der Karte angezeigt werden?": "Should this meetup be shown on the map?",
     "Sprache wechseln": "Change language",
@@ -367,7 +367,7 @@
     "System-generierte ID (nur lesbar)": "System generated ID (read-only)",
     "Systeminformationen": "System information",
     "Teilnahme": "Participation",
-    "Telegram": "",
+    "Telegram": "Telegram",
     "Telegram Link": "Telegram Link",
     "The given data was invalid.": "The given data was invalid.",
     "The response is not a streamed response.": "The response is not a streamed response.",
@@ -380,7 +380,7 @@
     "Toggle navigation": "Toggle navigation",
     "Too Many Requests": "Too Many Requests",
     "Toximalistisches Infotainment für bullische Bitcoiner.": "Toximalistic infotainment for bullish Bitcoiners.",
-    "Twitter": "",
+    "Twitter": "Twitter",
     "Twitter Benutzername": "Twitter username",
     "Twitter-Handle ohne @ Symbol": "Twitter handle without @ symbol",
     "Two Factor Authentication": "Two Factor Authentication",
@@ -426,7 +426,7 @@
     "Wann endet das Event?": "When does the event end?",
     "Wann findet das Event statt?": "When does the event take place?",
     "Webseite": "Website",
-    "Website": "",
+    "Website": "Website",
     "weitere Termine": "more dates",
     "Werde Bitcoin-Dozent und teile dein Expertenwissen mit der Community.": "Become a Bitcoin lecturer and share your expert knowledge with the community.",
     "When you enable two-factor authentication, you will be prompted for a secure pin during login. This pin can be retrieved from a TOTP-supported application on your phone.": "When you enable two-factor authentication, you will be prompted for a secure pin during login. This pin can be retrieved from a TOTP-supported application on your phone.",