Add Multilingual Support to the Talawa App

[palisadoes]

Parent Issue

Is your feature request related to a problem? Please describe.
Talawa Needs to have multilingual support to make it internationally acceptable.

Describe the solution you'd like
We need a way for users to easily select their language of choice which would immediately and permanently change the text to the new language until the language selection is changed.

Child Issues:

The following are child issues for this parent:

1. Develop a Language Localization File #799
2. Create an easy to use Multilingual Language Pack System #808
3. Refactor Hard Coded strings #800
4. Language Selection #801
5. Create Testing Mechanism for Language Selection #802
6. Update the User Data Model for Mulitlingual Language Support #803
7. Create a Testing Mechanism for the New Multilingual User Data model #804
8. Create frontend mutations for new language query calls #805
9. Update Profile Screens for Multilingual Support #806
10. Create backend mutations for new language query calls #807

[sumitra19jha]

@palisadoes Please assign me this issue