Better nl_NL translation
Sync db upgrade with db install to avoid silly upgrade errors
Merge branch 'upstream/3.4'
Fix for language
Fix problem field
Update ChangeLog
Merge pull request #1301 from aspangaro/3.4

Fix 3.4
Merge pull request #1299 from altairis-fr/3.4

fix wrong buy price update (confusion between entity and npr !)
Merge pull request #1297 from GPCsolutions/3.4-dbupgradefix

Sync db upgrade with db install to avoid silly upgrade errors
Merge pull request #1296 from FHenry/3.4

Better nl_NL translation
Fix bad translation on margin config