fix: remove double space (#44837)

* fix: typo in javascript-algorithms-and-data-structures > object-oriented-programming > understand-own-properties

* revert all the files with translations

* fix last commit error and remove changes from translated files

curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/understand-own-properties.md

@@ -12,7 +12,7 @@ In the following example, the `Bird` constructor defines two properties: `name`
 
 ```js
 function Bird(name) {
-  this.name  = name;
+  this.name = name;
   this.numLegs = 2;
 }