#849 Standardize submission subject lines

[Ahasuerus]

From the Community Portal (2016-01-27):

"... when viewing lists of submission records (via myrecent and recent) it seems the displayed "Subject" varies from current old value to submitted new value based on the submission type, e.g. PubUpdate and MakeVariant always choose the proposed submitted title, however, TitleUpdate always choose the old original title. I did not look into every submission type. It seems to me these should be more consistent. As a side note and in terms of considering which to standardize on, using the old value maybe more interesting when viewing submission records after successful moderation (because the diff won't show the old values after the submission is committed). Uzume"