fix(l10n): translated using Weblate (Greek)

Currently translated at 64.4% (78 of 121 strings)

Translation: ubuntu-desktop-translations/Ubuntu Flutter Plugins
Translate-URL: https://hosted.weblate.org/projects/ubuntu-desktop-translations/ubuntu-flutter-plugins/el/

Author: alex32156

packages/ubuntu_localizations/lib/src/l10n/ubuntu_el.arb

@@ -56,7 +56,7 @@
   "@downloadLabel": {},
   "editLabel": "Επεξεργασία",
   "@editLabel": {},
-  "errorLabel": "Λάθος",
+  "errorLabel": "Error",
   "@errorLabel": {},
   "executeLabel": "Εκτέλεση",
   "@executeLabel": {},
@@ -139,5 +139,21 @@
   "backAction": "Πηγαίνω πίσω",
   "@backAction": {},
   "weakPassword": "Αδύναμος κωδικός πρόσβασης",
-  "@weakPassword": {}
+  "@weakPassword": {},
+  "controlKey": "Control",
+  "@controlKey": {},
+  "metaKey": "Meta",
+  "@metaKey": {},
+  "shiftKey": "Shift",
+  "@shiftKey": {},
+  "altKey": "Alt",
+  "@altKey": {},
+  "boldLabel": "Bold",
+  "@boldLabel": {},
+  "bottomLabel": "Bottom",
+  "@bottomLabel": {},
+  "enterLabel": "Enter",
+  "@enterLabel": {},
+  "goBackLabel": "Go back",
+  "@goBackLabel": {}
 }