fix: rename Slovakia and South Africa common spa translations

fix #546

Author: mledoze

countries.json

@@ -34795,7 +34795,7 @@
             },
             "spa": {
                 "official": "Rep\u00fablica Eslovaca",
-                "common": "Rep\u00fablica Eslovaca"
+                "common": "Eslovaquia"
             },
             "srp": {
               "official": "Slova\u010dka republika",
@@ -41503,7 +41503,7 @@
             },
             "spa": {
                 "official": "Rep\u00fablica de Sud\u00e1frica",
-                "common": "Rep\u00fablica de Sud\u00e1frica"
+                "common": "Sud\u00e1frica"
             },
             "srp": {
               "official": "Republika Ju\u017ena Afrika",