Improve translation handling to avoid git conflicts.

diff --git a/po/de.po b/po/de.po.in
similarity index 100%
rename from po/de.po
rename to po/de.po.in

diff --git a/po/ms.po b/po/ms.po.in
similarity index 100%
rename from po/ms.po
rename to po/ms.po.in

diff --git a/po/nl.po b/po/nl.po.in
similarity index 100%
rename from po/nl.po
rename to po/nl.po.in

diff --git a/po/pl.po b/po/pl.po.in
similarity index 100%
rename from po/pl.po
rename to po/pl.po.in

diff --git a/po/sv.po b/po/sv.po.in
similarity index 100%
rename from po/sv.po
rename to po/sv.po.in