Update free answer quiz title (#877)

* Update title

* Update placeholder

Author: ivan-magda

Stepic/Sources/Modules/Quizzes/NewFreeAnswerQuiz/NewFreeAnswerQuizPresenter.swift

@@ -7,7 +7,7 @@ protocol NewFreeAnswerQuizPresenterProtocol {
 final class NewFreeAnswerQuizPresenter: NewFreeAnswerQuizPresenterProtocol {
     weak var viewController: NewFreeAnswerQuizViewControllerProtocol?
 
-    private lazy var quizPlaceholder = NSLocalizedString("StringQuizPlaceholder", comment: "")
+    private lazy var quizPlaceholder = NSLocalizedString("FreeAnswerQuizPlaceholder", comment: "")
 
     func presentReply(response: NewFreeAnswerQuiz.ReplyLoad.Response) {
         let viewModel = NewFreeAnswerQuizViewModel(

Stepic/en.lproj/Localizable.strings

@@ -919,7 +919,8 @@ SortingQuizTitle = "Sort a given list";
 MatchingQuizTitle = "Match two lists";
 SQLQuizTitle = "SQL Challenge - Enter SQL query";
 UnsupportedQuizTitle = "Unsupported step type";
-FreeAnswerQuizTitle = "Write an essay";
+FreeAnswerQuizTitle = "Write an answer";
+FreeAnswerQuizPlaceholder = "Enter text";
 FillBlanksQuizTitle = "Fill in the blanks";
 TableQuizTitle = "Select the right cells";
 

Stepic/ru.lproj/Localizable.strings

@@ -920,7 +920,8 @@ SortingQuizTitle = "Упорядочьте элементы списка";
 MatchingQuizTitle = "Сопоставьте значения из двух списков";
 SQLQuizTitle = "SQL Challenge - Введите SQL запрос";
 UnsupportedQuizTitle = "Неподдерживаемый тип шага";
-FreeAnswerQuizTitle = "Напишите эссе";
+FreeAnswerQuizTitle = "Напишите ответ";
+FreeAnswerQuizPlaceholder = "Введите текст";
 FillBlanksQuizTitle = "Заполните пробелы";
 TableQuizTitle = "Выберите верные ячейки";