Add import error postfix and extract more labels

components/labels.js

@@ -1,6 +1,8 @@
 export const settings = {
   shared: {
-    cancel: 'Cancel'
+    cancel: 'Cancel',
+    errorTitle: 'Error',
+    successTitle: 'Success'
   },
   export: {
     errors: {
@@ -19,6 +21,13 @@ export const settings = {
 1. Keep existing cycle days and replace only the ones in the import file.
 2. Delete all existing cycle days and import cycle days from file.`,
     replaceOption: 'Import and replace',
-    deleteOption: 'Import and delete existing'
+    deleteOption: 'Import and delete existing',
+    errors: {
+      couldNotOpenFile: 'Could not open file',
+      postFix: 'No data was imported or changed'
+    },
+    success: {
+      message: 'Data successfully imported'
+    }
   }
 }

components/settings.js

@@ -99,17 +99,22 @@ async function getFileContentAndImport({ deleteExisting }) {
   try {
     fileContent = await rnfs.readFile(fileInfo.uri, 'utf8')
   } catch (err) {
-    return alertError('Could not open file')
+    return importError(labels.import.errors.couldNotOpenFile)
   }
 
   try {
     await importCsv(fileContent, deleteExisting)
-    Alert.alert('Success', 'Data successfully imported')
+    Alert.alert(labels.import.success.title, labels.import.success.message)
   } catch(err) {
-    alertError(err.message)
+    importError(err.message)
   }
 }
 
 function alertError(msg) {
-  Alert.alert('Error', msg)
+  Alert.alert(labels.shared.errorTitle, msg)
+}
+
+function importError(msg) {
+  const postFixed = `${msg}\n\n${labels.import.errors.postFix}`
+  alertError(postFixed)
 }