Still untranslatable strings

In version 0.9.13.2, there’s still some untranslatable strings:

1. inc/class.lpr-question-type
   line 557: "Answer explanation"
2. inc/admin/lpr-admin-functions.php
   line 508-513
3. inc/admin/meta-boxes/fields/class.course-lesson-quiz.php
   line 115: 'Expand/Close'
   line 117: 'Remove'
   line 120: placeholder="Enter the section name and hit enter"
   line 145: 'Click to quick edit'
   line 146: 'Remove'
   line 147: 'Edit'
   line 155: 'Add Lesson'
   line 156: 'Add Quiz'
   line 157: 'Quick add <span>L</span>esson'
   line 158: 'Quick add <span>Q</span>uiz'
   line 167: 'Expand/Close'
   line 169: 'Remove'
   line 172: placeholder="Enter the section name and hit enter"
   line 180: 'Add Lesson'
   line 181: 'Add Quiz'
   line 182: 'Quick add <span>L</span>esson'
   line 183: 'Quick add <span>Q</span>uiz'
   line 193: 'Cancel [ESC]'
   line 194: 'Add [Enter]'
   line 201: 'Cancel [ESC]'
   line 202: 'Add [Enter]'
   line 210: 'Expand/Close'
   line 212: 'Remove'
   line 215: placeholder="Type section's name and hit enter"
   line 245: 'Click to quick edit'
   line 279: '--Select a Quiz--'
4. inc/admin/meta-boxes/fields/class.quiz-question.php
   line 157: -Or-
5. inc/custom-post-types/quiz.php
   line 118: 'How many times the user can re-take this quiz. Set to 0 to disable'
6. templates/profile/quiz-content.php
   line 13: 'point'
7. templates/quiz/result.php
   line 10: 'point'

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