Mark XModule strings for i18n

common/lib/xmodule/xmodule/js/src/annotatable/display.coffee

@@ -160,7 +160,10 @@ class @Annotatable
         @hideTips visible
 
     toggleAnnotationButtonText: (hide) ->
-        buttonText = (if hide then 'Show' else 'Hide')+' Annotations'
+        if hide
+            buttonText = gettext('Show Annotations')
+        else
+            buttonText = gettext('Hide Annotations')
         @$(@toggleAnnotationsSelector).text(buttonText)
 
     toggleInstructions: () ->
@@ -169,7 +172,10 @@ class @Annotatable
       @toggleInstructionsText hide
 
     toggleInstructionsButton: (hide) ->
-        txt = (if hide then 'Expand' else 'Collapse')+' Instructions'
+        if hide
+            txt = gettext('Expand Instructions')
+        else
+            txt = gettext('Collapse Instructions')
         cls = (if hide then ['expanded', 'collapsed'] else ['collapsed','expanded'])
         @$(@toggleInstructionsSelector).text(txt).removeClass(cls[0]).addClass(cls[1])
 
@@ -221,13 +227,14 @@ class @Annotatable
     makeTipTitle: (el) ->
         (api) =>
             title = $(el).data('comment-title')
-            (if title then title else 'Commentary')
+            (if title then title else gettext('Commentary'))
 
     createComment: (text) ->
         $("<div class=\"annotatable-comment\">#{text}</div>")
 
     createReplyLink: (problem_id) ->
-        $("<a class=\"annotatable-reply\" href=\"javascript:void(0);\" data-problem-id=\"#{problem_id}\">Reply to Annotation</a>")
+        linktxt = gettext('Reply to Annotation')
+        $("<a class=\"annotatable-reply\" href=\"javascript:void(0);\" data-problem-id=\"#{problem_id}\">#{linktxt}</a>")
 
     findVisibleTips: () ->
         visible = []

common/lib/xmodule/xmodule/js/src/capa/display.coffee

@@ -318,14 +318,16 @@ class @Problem
           @el.find('.problem > div').each (index, element) =>
             MathJax.Hub.Queue ["Typeset", MathJax.Hub, element]
 
-        @$('.show-label').text 'Hide Answer(s)'
+        `// Translators: the word Answer here refers to the answer to a problem the student must solve.`
+        @$('.show-label').text gettext('Hide Answer(s)')
         @el.addClass 'showed'
         @updateProgress response
     else
       @$('[id^=answer_], [id^=solution_]').text ''
       @$('[correct_answer]').attr correct_answer: null
       @el.removeClass 'showed'
-      @$('.show-label').text 'Show Answer(s)'
+      `// Translators: the word Answer here refers to the answer to a problem the student must solve.`
+      @$('.show-label').text gettext('Show Answer(s)')
 
       @el.find(".capa_inputtype").each (index, inputtype) =>
         display = @inputtypeDisplays[$(inputtype).attr('id')]
@@ -403,6 +405,7 @@ class @Problem
     formulaequationinput: (element) ->
       $(element).find('input').on 'input', ->
         $p = $(element).find('p.status')
+        `// Translators: the word Answer here is about answering a problem the student must solve.`
         $p.text gettext("unanswered")
         $p.parent().removeClass().addClass "unanswered"
 
@@ -431,7 +434,8 @@ class @Problem
     textline: (element) ->
       $(element).find('input').on 'input', ->
         $p = $(element).find('p.status')
-        $p.text "unanswered"
+        `// Translators: the word Answer here is about answering a problem the student must solve.`
+        $p.text gettext("unanswered")
         $p.parent().removeClass().addClass "unanswered"
 
   inputtypeSetupMethods: