fix: missing comma in translations

Author: spaenleh

src/langs/en.json

@@ -128,7 +128,7 @@
     "New Code": "New Code",
     "Line Offset": "Line Offset",
     "Save Setting to Preview": "Save Setting to Preview",
-    "Show Preview": "Show Preview"
+    "Show Preview": "Show Preview",
     "Pre-loaded libraries": "Preloaded Libraries",
     "Stop Execution": "Stop Execution",
     "Clear outputs and figures": "Clear Outputs and Figures",

src/langs/fr.json

@@ -126,7 +126,7 @@
     "New Code": "Nouveau Code",
     "Line Offset": "Décalage des lignes",
     "Save Setting to Preview": "Enregistrer les settings pour voir l'aperçu",
-    "Show Preview": "Ouvrir l'aperçu"
+    "Show Preview": "Ouvrir l'aperçu",
     "Pre-loaded libraries": "Librairies pré-chargées",
     "Stop Execution": "Arrêter l'exécution",
     "Clear outputs and figures": "Effacer les sorties et les figures",