adds strings to strings.xml for easier localization
+strings.xml for Spanish locale
adds some validation
changes some toasts
update readme
remove repeated string value
Merge pull request #72 from ollieh/master

Done tonnnnnns of stuff
Merge pull request #73 from dethstar/master

Fixes: force quit on back from barcode reader
Validates that the message is not empty
+updates readme
Merge pull request #74 from dethstar/master

Validates that the message is not empty
Update README.md
Removing redundant code
Merge