[openaddresses] adding Russian as the language for the Belarus data sets

resources/parser/data_sets/openaddresses.yaml

@@ -309,6 +309,7 @@ countries:
                     state: Гродненская область
                 files:
                     - filename: regionwide.csv
+                      language: ru
                       fields: *fields_with_unit
                       non_numeric_units: true
             mogilev:
@@ -316,6 +317,7 @@ countries:
                     state: Могилёвская область
                 files:
                     - filename: regionwide.csv
+                      language: ru
                       fields: *fields_with_unit
                       non_numeric_units: true
             vitebsk:
@@ -323,6 +325,7 @@ countries:
                     state: Витебская область
                 files:
                     - filename: regionwide.csv
+                      language: ru
                       fields: *fields_with_unit
                       non_numeric_units: true