Add base localization infrastructure and externalize strings (#670)

* Add base localization infrastructure and externalize strings

* Add Spanish localization scaffolding with translations

* Add machine translations for expanded locales

---------

Co-authored-by: jack <jackjackbits@users.noreply.github.com>

bitchat/Utils/Localization.swift

@@ -0,0 +1,12 @@
+import Foundation
+
+enum L10n {
+    static func string(_ key: String, comment: String) -> String {
+        NSLocalizedString(key, comment: comment)
+    }
+
+    static func format(_ key: String, comment: String, _ args: CVarArg...) -> String {
+        let format = NSLocalizedString(key, comment: comment)
+        return String(format: format, locale: Locale.current, arguments: args)
+    }
+}