Why don't you explain again about MEAN?

Question

MongoDB

Question 1
Storing data in MongoDB
We have a Product collection consisting of data from several other collections:
Conditions -> Product <- Colors
Each document in the Conditions and Colors collections is just a name, but in different languages

{
    "_id" : "557e90f5096e2cb81d59fc09",
    "name" : {
        "ru" : "Старый",
        "en" : "Old"
    },
    "__v" : 0
},

The data in the Product from the Conditions and Colors collections, I want to save in a denormalized form, i.e. just save it there

{ {"name" : { "ru":"Старый, "en": "old"}, {"name" : {"ru": "новый", "en":"new"}}

, but there is nothing permanent and sometimes the composition of the Product will still need to be changed in the admin panel, depending on changes in other collections, i.e., if I want to change "old" to "Not quite old" in Conditions - I want it to change and in Product. How to implement it? Store in product and ._id from Conditions and query "When we change name in Conditions, then we search through all collections where there is the same ._id and change it to a new one"?
Question 2
Languages ​​in Angular.js
Is it possible to declare an array of possible languages ​​​​(ru, en, de, fr) at the beginning of the application settings, so that later in the forms you can do something like:

<div ng-repeat="language in languages track by $index">
         <input ng-model="name.{{language}}">                        
 </div>

?

Answer 1

If I understood correctly what you need, then you would take the angular-translate library and just store the translations separately without changing the meaning of all words in all collections. And then it comes out very cold.

Answer 2

If you want cascade update, you should have chosen a relational database.
Regarding question #2 - use constants.