Fixed invalid ISO language code for Greek (#3183)

Author: alkisg

docs/setup/changing-the-language.md

@@ -35,6 +35,7 @@ The following languages are supported:
 - `cs` – Czech
 - `da` – Danish
 - `de` – German
+- `el` – Greek
 - `en` – English
 - `eo` – Esperanto
 - `es` – Spanish
@@ -43,7 +44,6 @@ The following languages are supported:
 - `fi` – Finnish
 - `fr` – French
 - `gl` – Galician
-- `gr` – Greek
 - `he` – Hebrew
 - `hi` – Hindi
 - `hr` – Croatian

material/partials/languages/gr.html renamed to material/partials/languages/el.html

@@ -2,7 +2,7 @@
   This file was automatically generated - do not edit
 -#}
 {% macro t(key) %}{{ {
-  "language": "gr",
+  "language": "el",
   "clipboard.copy": "Αντιγραφή",
   "clipboard.copied": "Αντιγράφηκε",
   "edit.link.title": "Επεξεργασία αυτής της σελίδας",

src/partials/languages/gr.html renamed to src/partials/languages/el.html

@@ -22,7 +22,7 @@
 
 <!-- Translations: Greek -->
 {% macro t(key) %}{{ {
-  "language": "gr",
+  "language": "el",
   "clipboard.copy": "Αντιγραφή",
   "clipboard.copied": "Αντιγράφηκε",
   "edit.link.title": "Επεξεργασία αυτής της σελίδας",