Localization standards (trustwallet#127)

* Localization standards

* Simplify generic names to just words

* Update code.md

docs/code.md

@@ -0,0 +1,39 @@
+### Localization
+
+Format for localization keys:
+`feature.section.element.type`, or could be simply as `feature.section.type`
+
+Examples:
+```
+key: transactions.myAddress.button.title, 
+value: My Address
+comment: The title of the my address button on the transactions page
+
+key: deposit.buy.button.coinbase.title, 
+value: via Coinbase
+comment: The title of the deposit button in the alert sheet
+
+key: exchange.error.failedToGetRates
+value: Failed to get rates
+comment: Error messesage when failed to update rates on pairs of tokens
+
+
+
+key: welcome.privateAndSecure.label.title
+value: Private & Secure
+comment: 
+
+key: welcome.privateAndSecure.label.description
+value: Private keys never leave your device.
+comment:
+
+```
+
+Generic keys and values:
+```
+Ok - Ok
+Cancel - Cancel
+Done - Done
+Send - Send
+Refresh - Refresh
+```