ISSUE-38 Add internationalization (i18n) to shift all the ui constants to a language specific JSON file

[sanjevShakya]

• [x] Use of reacti18next
• [x] Example translation code in login component
• [x] translation in en>translation.json (default translation namespace for react-i18n)

Note: Key difference between react-intl and react-i18next are

1. Keys cannot be nested in JSON file.
2. Have out of the box lazy-load feature to import different translation files
3. Have the ability to change the language with simple provided function
4. Have the ability to turn debug on/off and provides if the translations are missing in the console.

closes #38