Merge lp:~widelands-dev/widelands/bug-1809838-document-mill into lp:widelands

[Notabilis]

Documenting "strange" behavior of atlanteans mill for players.

The mill is always grinding blackroot, even when the economy target is met. This branch documents this behavior for players so it isn't considered/reported as bug.

[GunChleoc (gunchleoc)]

Text looks good, Can you make it translatable, please?

pgettext("atlanteans_building", text)

Let's have it for Build 21 so we won't break string freeze again.

[bunnybot (widelandsofficial)]

Continuous integration builds have changed state:

Travis build 4613. State: errored. Details: https://travis-ci.org/widelands/widelands/builds/508113746.
Appveyor build 4400. State: failed. Details: https://ci.appveyor.com/project/widelands-dev/widelands/build/_widelands_dev_widelands_bug_1809838_document_mill-4400.

[bunnybot (widelandsofficial)]

Continuous integration builds have changed state:

Travis build 4631. State: errored. Details: https://travis-ci.org/widelands/widelands/builds/510422490.
Appveyor build 4418. State: success. Details: https://ci.appveyor.com/project/widelands-dev/widelands/build/_widelands_dev_widelands_bug_1809838_document_mill-4418.

[GunChleoc (gunchleoc)]

review: Approve

[GunChleoc (gunchleoc)]

@bunnybot merge force

=== modified file 'data/tribes/buildings/productionsites/atlanteans/mill/helptexts.lua'
--- data/tribes/buildings/productionsites/atlanteans/mill/helptexts.lua	2018-05-04 20:38:53 +0000
+++ data/tribes/buildings/productionsites/atlanteans/mill/helptexts.lua	2019-03-23 21:03:46 +0000
@@ -18,7 +18,7 @@
 
 function building_helptext_note()
    -- TRANSLATORS#: Note helptext for a building
-   return ""
+   return pgettext("atlanteans_building", "When no cornmeal is required, the mill will try to produce blackroot flour even when there is no demand for it.")
 end
 
 function building_helptext_performance()