Improve naming of the rotate button

So it's clear that the signature gets rotated and not the PDF

src/i18n/de/translation.json

@@ -112,7 +112,7 @@
     "last-page": "Letzte Seite",
     "page-count": "von {{totalPages}}",
     "rotate-signature": "Signatur im Uhrzeigersinn rotieren",
-    "rotate": "Rotieren",
+    "rotate": "Signatur rotieren",
     "continue": "Platzierung bestätigen"
   },
   "error-summary": "Ein Fehler ist aufgetreten",

src/i18n/en/translation.json

@@ -112,7 +112,7 @@
     "last-page": "Last page",
     "page-count": "of {{totalPages}}",
     "rotate-signature": "Rotate signature clockwise",
-    "rotate": "Rotate",
+    "rotate": "Rotate signature",
     "continue": "Confirm placement"
   },
   "error-summary": "An error occurred",