misc: use a single word for each time unit (#88822)

wcs/qommon/humantime.py

@@ -56,6 +56,7 @@ def humanduration2seconds(humanduration):
         raise ValueError()
     seconds = 0
     for (word1, word2, dummy), quantity in _humandurations:
+        # look for number then singular or plural forms of unit
         m = re.search(r'(\d+)\s*\b(%s|%s)\b' % (word1, word2), humanduration)
         if m:
             seconds = seconds + int(m.group(1)) * quantity