Added navigation to application, internationalization, and sign in screen.

translations/en-US/common.json

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+{
+	"translation": {
+		"general": {
+			"actions": {
+				"signout": "Sign Out"
+			}
+		},
+		"joblist": {
+			"labels": {
+				"activejobs": "All Active Jobs"
+			},
+			"titles": {
+				"jobtab": "Jobs"
+			}
+		},
+		"messaging": {
+			"titles": {
+				"messagingtab": "Messaging"
+			}
+		},
+		"settings": {
+			"titles": {
+				"settings": "Settings"
+			}
+		},
+		"signin": {
+			"actions": {
+				"signin": "Sign In"
+			},
+			"fields": {
+				"email": "Email",
+				"password": "Password"
+			}
+		}
+	}
+}

translations/es-MX/common.json

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+{
+	"translation": {
+		"general": {
+			"actions": {
+				"signout": ""
+			}
+		},
+		"joblist": {
+			"labels": {
+				"activejobs": ""
+			},
+			"titles": {
+				"jobtab": ""
+			}
+		},
+		"messaging": {
+			"titles": {
+				"messagingtab": ""
+			}
+		},
+		"settings": {
+			"titles": {
+				"settings": ""
+			}
+		},
+		"signin": {
+			"actions": {
+				"signin": ""
+			},
+			"fields": {
+				"email": "Email",
+				"password": ""
+			}
+		}
+	}
+}

translations/fr-CA/common.json

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+{
+	"translation": {
+		"general": {
+			"actions": {
+				"signout": ""
+			}
+		},
+		"joblist": {
+			"labels": {
+				"activejobs": ""
+			},
+			"titles": {
+				"jobtab": ""
+			}
+		},
+		"messaging": {
+			"titles": {
+				"messagingtab": ""
+			}
+		},
+		"settings": {
+			"titles": {
+				"settings": ""
+			}
+		},
+		"signin": {
+			"actions": {
+				"signin": ""
+			},
+			"fields": {
+				"email": "Email",
+				"password": ""
+			}
+		}
+	}
+}

translations/i18n.js

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+import Localization from "expo-localization";
+import i18n from "i18next";
+import { initReactI18next } from "react-i18next";
+import en_Translation from "./en-US/common.json";
+import es_Translation from "./es-MX/common.json";
+import fr_Translation from "./fr-CA/common.json";
+
+// the translations
+// (tip move them in a JSON file and import them)
+const resources = {
+  "en-US": en_Translation,
+  "fr-CA": fr_Translation,
+  "es-MX": es_Translation,
+};
+
+// creating a language detection plugin using expo
+// http://i18next.com/docs/ownplugin/#languagedetector
+const languageDetector = {
+  type: "languageDetector",
+  async: true, // flags below detection to be async
+  detect: (callback) => {
+    return Localization.getLocalizationAsync().then(({ locale }) => {
+      callback(locale);
+    });
+  },
+  init: () => {},
+  cacheUserLanguage: () => {},
+};
+
+i18n.use(initReactI18next).init({
+  lng: "en-US",
+  fallbackLng: "en-US",
+  resources,
+  // have a common namespace used around the full app
+  //   ns: ["common"],
+  //   defaultNS: "common",
+  debug: true,
+  // cache: {
+  //   enabled: true
+  // },
+  interpolation: {
+    escapeValue: false, // not needed for react as it does escape per default to prevent xss!
+  },
+});
+
+export default i18n;