[CHORE] Trustlines: Add balance and currency to delete trustline messaging
Merge pull request #1382 from yongsoo/chore/incoming_trustline

[TASK] Trustlines: Add balance and currency to delete trustline messaging
[FIX] RT-1206: Detect browser language preferences

1. Detect user's browser language settings, and if we have a translation available in that language, display client in that language
2. If we don't have a translation available, display client in English
3. If a invalid language was selected (such as navigate to `#/lang/abcdefg`), display client in default language (as 1 & 2).

* For languages with variants such as `zh-CN` and `en-US`, we will treat thoses as `zh` and `en`.
* A language alias map is introduced as the browser uses `zh` for Chinese but we use `cn` for Chinese.
[FIX] Navbar: Removed cashin reference
[FIX] RT-1730 Pull-Request

Take out unnecessary changes to validators directive
[CHORE] Fund/Accounts UI: Add template for new accounts tab
[FEATURE] Fund UI: Trust lines show up based on currency
[TASK] Fund UI: Add add trust UI