fix(i18n): drop the string that named the removed script, take @Vaso73's Slovak

The argos run read a copy of lang/ from before #379, so the key naming
proxmenux-oci.sh came back with it — in all seven locales, pointing at a
file that no longer exists. Removed.

The Monitor category takes the Slovak @Vaso73 supplied: Správy a
upozornenia.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

AppImage/messages/sk/common.json

@@ -1508,7 +1508,6 @@
       "containerNameLabel": "Názov kontajnera",
       "containerNamePlaceholder": "napr. <your-container-name>",
       "ociLabelKeyLabel": "Kľúč OCI labelu",
-      "ociLabelPlaceholder": "org.opencontainers.image.version",
       "pythonInterpreterLabel": "Cesta k Python interpreteru",
       "pythonInterpreterPlaceholder": "napr. /opt/<your-app>/venv/bin/python",
       "pipDistLabel": "Názov distribúcie (pip balík)",
@@ -5068,7 +5067,7 @@
       "hostManagement": "Správa servera",
       "iotSmartHome": "IoT a inteligentná domácnosť",
       "mediaStreaming": "Médiá a streamovanie",
-      "messagingNotifications": "Messaging & Notifications",
+      "messagingNotifications": "Správy a upozornenia",
       "miscellaneous": "Ostatné",
       "monitoringAnalytics": "Monitorovanie a analýza",
       "nvrCameras": "NVR a kamery",