fix unit strings

Fixes #3295
Closes #3320

//FREEBIE

res/values/strings.xml

@@ -158,6 +158,7 @@
 
     <!-- DateUtils -->
     <string name="DateUtils_now">Now</string>
+    <string name="DateUtils_minutes_ago">%d min</string>
 
     <!-- ShareActivity -->
     <string name="ShareActivity_share_with">Share with</string>
@@ -684,11 +685,6 @@
     <string name="arrays__use_custom">Use custom</string>
 
     <!-- plurals.xml -->
-    <plurals name="minutes_ago">
-        <item quantity="one">%d min</item>
-        <item quantity="other">%d mins</item>
-    </plurals>
-
     <plurals name="hours_ago">
         <item quantity="one">%d hour</item>
         <item quantity="other">%d hours</item>

src/org/thoughtcrime/securesms/util/DateUtils.java

@@ -50,7 +50,7 @@ public class DateUtils extends android.text.format.DateUtils {
       return c.getString(R.string.DateUtils_now);
     } else if (isWithin(timestamp, 1, TimeUnit.HOURS)) {
       int mins = convertDelta(timestamp, TimeUnit.MINUTES);
-      return c.getResources().getQuantityString(R.plurals.minutes_ago, mins, mins);
+      return c.getResources().getString(R.string.DateUtils_minutes_ago, mins);
     } else if (isWithin(timestamp, 1, TimeUnit.DAYS)) {
       int hours = convertDelta(timestamp, TimeUnit.HOURS);
       return c.getResources().getQuantityString(R.plurals.hours_ago, hours, hours);
@@ -68,7 +68,7 @@ public class DateUtils extends android.text.format.DateUtils {
       return c.getString(R.string.DateUtils_now);
     } else if (isWithin(timestamp, 1, TimeUnit.HOURS)) {
       int mins = (int)TimeUnit.MINUTES.convert(System.currentTimeMillis() - timestamp, TimeUnit.MILLISECONDS);
-      return c.getResources().getQuantityString(R.plurals.minutes_ago, mins, mins);
+      return c.getResources().getString(R.string.DateUtils_minutes_ago, mins);
     } else {
       StringBuilder format = new StringBuilder();
       if      (isWithin(timestamp,   6, TimeUnit.DAYS)) format.append("EEE ");