don't show 'first' when link is same as 'previous' button

figured later i should have fixed the 'first' button as well, no point in showing it when the back button points to the same page.
Update preview mode
Fix NativeLabelTranslatorStrategy whitespace bug
Update composer.json
Merge pull request #1384 from EmmanuelVella/preview

Update preview mode
Merge pull request #1386 from pulzarraider/native_label_translator_fix

Fix NativeLabelTranslatorStrategy whitespace bug
Merge pull request #1367 from sjopet/patch-5

don't show 'first' when link is same as 'previous' button
[translation][ja] add missing Japanese translation
[translation][ja] tweaks for Japanese translation
custom date and datetime formats in list
documentation
custom date and datetime formats in show
Merge pull request #1388 from 77web/translation-ja

[translation][ja] update Japanese translation file
Merge pull request #1390 from tiagojsag/list_date_format

Custom date and datetime formats in list
Fix revision layout
Fix deprecated call
Fix composer.json config for exporter
Update UPGRADE-2.1.md

Tweaks to the grammar used to make the upgrade text more readable
Merge pull request #1395 from caponica/master

Minor changes to make upgrade text more readable
Update UPGRADE-2.2.md