Add Russian frequency units (#829)

Co-authored-by: DmitrievDV <[email protected]>

Author: Dblm0

Common/UnitDefinitions/Frequency.json

@@ -16,6 +16,10 @@
         {
           "Culture": "en-US",
           "Abbreviations": [ "Hz" ]
+        },
+        {
+          "Culture": "ru-RU",
+          "Abbreviations": [ "Гц" ]
         }
       ]
     },
@@ -29,6 +33,10 @@
         {
           "Culture": "en-US",
           "Abbreviations": [ "rad/s" ]
+        },
+        {
+          "Culture": "ru-RU",
+          "Abbreviations": [ "рад/с" ]
         }
       ]
     },
@@ -77,6 +85,10 @@
         {
           "Culture": "en-US",
           "Abbreviations": [ "s⁻¹" ]
+        },
+        {
+          "Culture": "ru-RU",
+          "Abbreviations": [ "с⁻¹" ]
         }
       ]
     }