fix for "undefined" showing up in the dashboard on the TIME SPENT wid…

…get. This commit only fixes it for the US English translation, though. To fix it for the other translations, a string named "common.year.abrv" needs to be added to the other language dashboard_*.properties files.

Bug references:
#88
http://support.count.ly/discussions/problems/282-some-of-ui-elements-are-undefined

This commit also contains a fix for a separate minor misspelling error in the US English translation.

frontend/express/public/localization/dashboard/dashboard.properties

@@ -44,7 +44,7 @@ common.ok = OK
 common.total = Total
 common.save-changes = Save changes
 common.graph-max = Maximum <b>{0}</b> {1} reached on <b>{2}</b>
-common.graph-min = Minumum <b>{0}</b> {1} on <b>{2}</b>
+common.graph-min = Minimum <b>{0}</b> {1} on <b>{2}</b>
 common.graph.time-spent = Time Spent (min)
 common.graph.average-time = Avg. Time Spent (min)
 common.graph.reqs-received = Requests Received
@@ -55,6 +55,7 @@ common.hour = hour
 common.minute.abrv = min
 common.hour.abrv = hr
 common.day.abrv = days
+common.year.abrv = yrs
 common.buckets.monthly = monthly
 common.buckets.weekly = weekly
 common.buckets.daily = daily

frontend/express/public/localization/dashboard/dashboard_en.properties

@@ -44,7 +44,7 @@ common.ok = OK
 common.total = Total
 common.save-changes = Save changes
 common.graph-max = Maximum <b>{0}</b> {1} reached on <b>{2}</b>
-common.graph-min = Minumum <b>{0}</b> {1} on <b>{2}</b>
+common.graph-min = Minimum <b>{0}</b> {1} on <b>{2}</b>
 common.graph.time-spent = Time Spent (min)
 common.graph.average-time = Avg. Time Spent (min)
 common.graph.reqs-received = Requests Received
@@ -55,6 +55,7 @@ common.hour = hour
 common.minute.abrv = min
 common.hour.abrv = hr
 common.day.abrv = days
+common.year.abrv = yrs
 common.buckets.monthly = monthly
 common.buckets.weekly = weekly
 common.buckets.daily = daily