Create MO parser

Refactored a bit too, so we can use interfaces to take Mo and Po files

added fixtures

found that the parser for Po files have a bug... but it works... so not touched

translator.go

@@ -0,0 +1,15 @@
+/*
+ * Copyright (c) 2018 DeineAgentur UG https://www.deineagentur.com. All rights reserved.
+ * Licensed under the MIT License. See LICENSE file in the project root for full license information.
+ */
+
+package gotext
+
+type Translator interface {
+	ParseFile(f string)
+	Parse(buf []byte)
+	Get(str string, vars ...interface{}) string
+	GetN(str, plural string, n int, vars ...interface{}) string
+	GetC(str, ctx string, vars ...interface{}) string
+	GetNC(str, plural string, n int, ctx string, vars ...interface{}) string
+}