Merge gamification branch with master (#1752)

* Quiz  (#1629)

*  Layout inflated

*  Layout for mcq added

*  Inflated Basic Layout

*  Implemented basic flow

*  Added the basic implementation pf score

*  Added the result layout

*  Added the result layout

*  Added functionality to set result

*  Changed the launcher intent to Quiz Activity for testing purpose

*  Explanations of answers added

*  Improved the layout of quiz result a bit

*  Fixed some minor issues

*  Fixed build issues

* Api Added and basic structure for calling implemented

* Added intents

*  Added the title

*  Fixed image error and improved quality of pr

*  Made separate class for checking quiz

*  Added counter

* Implemented back and next for quiz result

*  Added back functionality to quiz

*  Added progressBar

*  Fixed bugs

*  Improved code quality

*  Imporved code Quality

*  Updated strings

*  Added share screenshot function

*  Added checks and improved UI

*  Removed unused string

*  Removed unused string

* Adding checks and improving code quality

* Changed string

* Improved code quality

* Update strings.xml

* Update MediaWikiApi.java

* Fix build

app/src/main/res/values/strings.xml

@@ -304,6 +304,26 @@
   <string name="wikidata_edit_failure">Failed to update corresponding Wikidata entity!</string>
   <string name="menu_set_wallpaper">Set wallpaper</string>
   <string name="wallpaper_set_successfully">Wallpaper set successfully!</string>
+  <string name="quiz">Quiz</string>
+  <string name="quiz_question_string">Is this picture OK to upload?</string>
+  <string name="question">Question</string>
+  <string name="result">Result</string>
+  <string name="quiz_back_button">If you carry on uploading images that require deletion, your account will likely be banned. Are you sure you want to end the quiz?</string>
+  <string name="quiz_alert_message">More than %1$s of the images you uploaded have been deleted. If you carry on uploading images that require deletion, your account will likely be banned.\n\nWould you like to view the tutorial again and then take a quiz to help you learn what type of images you should or shouldn\'t upload?</string>
+  <string name="selfie_answer">Selfies do not have much encyclopedic value. Please do not upload a picture of yourself unless you already have a Wikipedia article about you.</string>
+  <string name="taj_mahal_answer">Pictures of monuments and outside scenery is OK to upload in most countries. Please note that temporary art installations outside are often copyrighted and not OK to upload.</string>
+  <string name="screenshot_answer">Screenshots of websites are considered derivatives works and subject to any copyright on the website itself. These can be used after permission from the author. Without such permission, any art you create based on their work is legally considered an unlicensed copy owned by the original author.</string>
+  <string name="blurry_image_answer">One of the goals of Commons is to gather quality images. Therefore, blurry images shouldn\'t be uploaded. Always try to take nice pictures with good lighting.</string>
+  <string name="construction_event_answer">Pictures showing technology or culture are very welcome on Commons.</string>
+  <string name="warning_for_image_reverts">WARNING : More than %1$s of the images you uploaded have been deleted. If you carry on uploading images that require deletion, your account will likely be banned.</string>
+  <string name="congratulatory_message_quiz">You got %1$s of the answers correct. Congratulations!</string>
+  <string name="warning_for_no_answer">Select one of the two options to answer the question</string>
+  <string name="user_not_logged_in">Login session expired, please log in again.</string>
+  <string name="quiz_result_share_message">Share your quiz with your friends!</string>
+  <string name="continue_message">Continue</string>
+  <string name="correct">Correct Answer</string>
+  <string name="wrong">Wrong Answer</string>
+
   <string name="delete_recent_searches_dialog">Are you sure you want to clear your search history?</string>
   <string name="search_history_deleted">Search history deleted</string>
 
@@ -321,5 +341,4 @@
   <string name="images_uploaded_explanation">The number of images you have uploaded to Commons, via any upload software</string>
   <string name="images_reverted_explanation">The percentage of images you have uploaded to Commons that were not deleted</string>
   <string name="images_used_explanation">The number of images you have uploaded to Commons that were used in Wikimedia articles</string>
-  <string name="user_not_logged_in">Login session expired, please log in again.</string>
 </resources>