Fix Android strings XML syntax

Author: FloEdelmann

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

@@ -154,7 +154,7 @@ The info you enter is directly added to OpenStreetMap in your name, without the
     <string name="quest_generic_answer_notApplicable">"Can’t say…"</string>
 
     <string name="quest_generic_answer_does_not_exist">It does not exist…</string>
-    <string name="osm_element_gone_description">"Are you sure that it does not exist, not even at a slightly different location? If you’re not sure, leave a note instead.</string>
+    <string name="osm_element_gone_description">"Are you sure that it does not exist, not even at a slightly different location? If you’re not sure, leave a note instead."</string>
     <string name="osm_element_gone_confirmation">It does not exist</string>
     <string name="leave_note">Leave note</string>
     <string name="note_for_object">Another person noted:</string>
@@ -252,7 +252,7 @@ Additionally, some overlays allow you to add new data at the position of a displ
     <string name="quest_disable_action">Disable</string>
     <string name="quest_disable_title">Disable this quest type?</string>
     <string name="quest_disable_message_not_installed">"StreetMeasure is not installed (yet)."</string>
-    <string name="quest_disable_message_not_working">"StreetMeasure didn’t return a measurement.</string>
+    <string name="quest_disable_message_not_working">"StreetMeasure didn’t return a measurement."</string>
     <string name="quest_disable_message_tape_measure">You could use a tape measure instead, but that might be a little awkward, after all.</string>
 
     <!-- Notifications -->
@@ -263,7 +263,7 @@ Additionally, some overlays allow you to add new data at the position of a displ
     <string name="quest_selection_hint_title">Too much to do?</string>
     <string name="quest_selection_hint_message">"Contributing should primarily be fun!
 
-If you are overwhelmed by the number of quests, you can always fine-tune which quests are displayed to you and in what order in the settings.</string>
+If you are overwhelmed by the number of quests, you can always fine-tune which quests are displayed to you and in what order in the settings."</string>
 
 
     <!-- Team mode -->
@@ -1254,7 +1254,7 @@ If there are no signs along the whole street which apply for the highlighted sec
     <string name="quest_openingHours_add_weekdays">"Add days of the week"</string>
     <string name="quest_openingHours_add_off_days">"Add off days"</string>
     <string name="quest_openingHours_off_day">"Off day"</string>
-    <string name="quest_openingHours_unspecified_range">Not specified"</string>
+    <string name="quest_openingHours_unspecified_range">"Not specified"</string>
     <string name="quest_openingHours_chooseMonthsTitle">"Select months"</string>
     <string name="quest_openingHours_chooseWeekdaysTitle">"Select days of the week"</string>
     <string name="quest_openingHours_24_7_confirmation">"In other words, is it open any time, every day?"</string>