allow to encrypt keys in db, add browser-only key generator, add hints that private keys are stored on the server (#420)

frontend/src/lang/translations/de.json

@@ -39,7 +39,8 @@
     "profile": "Mein Profil",
     "settings": "Einstellungen",
     "login": "Anmelden",
-    "logout": "Abmelden"
+    "logout": "Abmelden",
+    "keygen": "Schlüsselgenerator"
   },
   "home": {
     "headline": "WireGuard® VPN Portal",
@@ -188,6 +189,25 @@
       "api-link": "API Dokumentation"
     }
   },
+  "keygen": {
+    "headline": "WireGuard Key Generator",
+    "abstract": "Hier können Sie WireGuard Schlüsselpaare generieren. Die Schlüssel werden lokal auf Ihrem Computer generiert und niemals an den Server gesendet.",
+    "headline-keypair": "Neues Schlüsselpaar",
+    "headline-preshared-key": "Neuer Pre-shared Key",
+    "button-generate": "Erzeugen",
+    "private-key": {
+      "label": "Private Key",
+      "placeholder": "Der private Schlüssel"
+    },
+    "public-key": {
+      "label": "Public Key",
+      "placeholder": "Der öffentliche Schlüssel"
+    },
+    "preshared-key": {
+      "label": "Preshared Key",
+      "placeholder": "Der Pre-shared Schlüssel"
+    }
+  },
   "modals": {
     "user-view": {
       "headline": "User Account:",
@@ -420,7 +440,8 @@
       },
       "private-key": {
         "label": "Private Key",
-        "placeholder": "The private key"
+        "placeholder": "The private key",
+        "help": "Der private Schlüssel wird sicher auf dem Server gespeichert. Wenn der Benutzer bereits eine Kopie besitzt, kann dieses Feld entfallen. Der Server funktioniert auch ausschließlich mit dem öffentlichen Schlüssel des Peers."
       },
       "public-key": {
         "label": "Public Key",

frontend/src/lang/translations/en.json

@@ -40,7 +40,8 @@
     "settings": "Settings",
     "audit": "Audit Log",
     "login": "Login",
-    "logout": "Logout"
+    "logout": "Logout",
+    "keygen": "Key Generator"
   },
   "home": {
     "headline": "WireGuard® VPN Portal",
@@ -206,6 +207,25 @@
       "message": "Message"
     }
   },
+  "keygen": {
+    "headline": "WireGuard Key Generator",
+    "abstract": "Generate a new WireGuard keys. The keys are generated in your local browser and are never sent to the server.",
+    "headline-keypair": "New Key Pair",
+    "headline-preshared-key": "New Preshared Key",
+    "button-generate": "Generate",
+    "private-key": {
+        "label": "Private Key",
+        "placeholder": "The private key"
+    },
+    "public-key": {
+        "label": "Public Key",
+        "placeholder": "The public key"
+    },
+    "preshared-key": {
+        "label": "Preshared Key",
+        "placeholder": "The pre-shared key"
+    }
+  },
   "modals": {
     "user-view": {
       "headline": "User Account:",
@@ -439,7 +459,8 @@
       },
       "private-key": {
         "label": "Private Key",
-        "placeholder": "The private key"
+        "placeholder": "The private key",
+        "help": "The private key is stored securely on the server. If the user already holds a copy, you may omit this field. The server still functions exclusively with the peer’s public key."
       },
       "public-key": {
         "label": "Public Key",