There something like that in KamilLelonek pullrequest. I know you did that pull request before his, but he solved that with plurals. I think it's better to use:

<plurals name="numberOfYears">
+        <item quantity="one">one year</item>
+        <item quantity="other">%d years</item>
+    </plurals>
+    <plurals name="numberOfMonths">
+        <item quantity="one">one month</item>
+        <item quantity="other">%d months</item>
+    </plurals>
+    <plurals name="numberOfDays">
+        <item quantity="one">one day</item>
+        <item quantity="other">%d days</item>
+    </plurals>
+    <plurals name="numberOfHours">
+        <item quantity="one">one hour</item>
+        <item quantity="other">%d hours</item>
+    </plurals>
+    <plurals name="numberOfMinutes">
+        <item quantity="one">one minute</item>
+        <item quantity="other">%d minutes</item>
+    </plurals>