add configurable parameters for done, cancel and albums text

Author: Christian Mayr

nativescript-imagepicker/index.d.ts

@@ -80,8 +80,21 @@ interface Options {
      */
     mode?: string;
 
+    /**
+    * Set the text for the done button in iOS
+    */
     doneText?: string;
 
+    /**
+    * Set the text for the cancel button in iOS
+    */
+    cancelText?: string;
+
+    /**
+    * Set the text for the albums button in iOS
+    */
+    albumsText?: string;
+
     android?: {
         /**
          * Provide a reason for permission request to access external storage on api levels above 23.

nativescript-imagepicker/viewmodel.ios.ts

@@ -74,11 +74,11 @@ export class ImagePicker extends data_observable.Observable {
     }
 
     get cancelText(): string {
-        return "Cancel";
+        return this._options && this._options.cancelText ? this._options.cancelText : "Cancel";
     }
 
     get albumsText(): string {
-        return "Albums";
+        return this._options && this._options.albumsText ? this._options.albumsText :  "Albums";
     }
 
     get mode(): string {