Fixes wrong values used in RAM usage section (#344)

i18n/locales/de.json

@@ -294,7 +294,7 @@
       "activeInactiveUsers": "Aktive/inaktive Benutzer",
       "activeUsers": "Aktive Benutzer",
       "allVersionsCombined": "Alle Versionen zusammen",
-      "availableRam": "({freeRam} / {totalRam})",
+      "availableRam": "({usedRam} / {totalRam})",
       "biggestGamesOnServer": "Größte Spiele auf dem Server",
       "biggestGamesToDownload": "Die größten Spiele zum Herunterladen",
       "cpuUsage": "CPU Nutzung",

i18n/locales/en_us.json

@@ -347,7 +347,7 @@
       "activeInactiveUsers": "Active/inactive users",
       "activeUsers": "Active users",
       "allVersionsCombined": "All versions combined",
-      "availableRam": "({freeRam} / {totalRam})",
+      "availableRam": "({usedRam} / {totalRam})",
       "biggestGamesOnServer": "Biggest games on server",
       "biggestGamesToDownload": "Biggest games to download",
       "cpuUsage": "CPU usage",

i18n/locales/fr.json

@@ -294,7 +294,7 @@
       "activeInactiveUsers": "Utilisateurs actifs/inactifs",
       "activeUsers": "Utilisateurs actifs",
       "allVersionsCombined": "Toutes les versions combinées",
-      "availableRam": "({freeRam} / {totalRam})",
+      "availableRam": "({usedRam} / {totalRam})",
       "biggestGamesOnServer": "Les plus gros jeux sur le serveur",
       "biggestGamesToDownload": "Les plus gros jeux à télécharger",
       "cpuUsage": "Utilisation du processeur",