Fix up localizations.

include/lang/de.rem

@@ -77,7 +77,4 @@ TRANSLATE "Aphelion" "Aphel"
 TRANSLATE "Daylight Saving Time Starts" "Beginn Sommerzeit"
 TRANSLATE "Daylight Saving Time Ends" "Ende Sommerzeit"
 
-TRANSLATE "Sunrise" "Sonnenaufgang"
-TRANSLATE "Sunset" "Sonnenuntergang"
-
 TRANSLATE "No reminders." "Keine Termine."

include/lang/nl.rem

@@ -65,9 +65,6 @@ FSET - subst_s(a, d, t) iif(day(d) == 1 || day(d) == 8, "e", day(d) < 20, "de",
 
 FSET - ordx(n) n + "e"
 
-TRANSLATE "Sunrise" "Zonsopgang"
-TRANSLATE "Sunset" "Zonsondergang"
-
 TRANSLATE "No reminders." "Geen herinneringen."
 
 TRANSLATE "Daylight Saving Time Begins" "Daglicht-sparende tijd begint"

include/sun.rem

@@ -1,6 +1,11 @@
 # Sunrise and sunset
 # SPDX-License-Identifier: GPL-2.0-only
 
+# Localize if we can
+IF access($SysInclude + "/translations/" + _("LANGID") + "/sun.rem", "r") >= 0
+    SYSINCLUDE translations/[_("LANGID")]/sun.rem
+ENDIF
+
 IF !$CalMode && !$PsCal
     REM NOQUEUE AT [sunrise()] MSG %"%"%(Sunrise) %! %2.
     REM NOQUEUE AT [sunset()] MSG %"%"%(Sunset) %! %2.

include/translations/README.txt

@@ -0,0 +1,17 @@
+The files here contain additional translations for various files
+distributed with Remind.
+
+If you create a file in $SysInclude whose name is "myfile.rem", then
+you can enable translation by putting this at the top of your
+file:
+
+#===================================================================
+# Localize if we can
+IF access($SysInclude + "/translations/" + _("LANGID") + "/myfile.rem", "r") >= 0
+    SYSINCLUDE translations/[_("LANGID")]/myfile.rem
+ENDIF
+#===================================================================
+
+Then you can localize your file by putting appropriate TRANSLATION directives
+in the file $SysInclude/translations/<LC>/myfile.rem where <LC> is the
+two-character language code.

include/translations/de/sun.rem

@@ -0,0 +1,2 @@
+TRANSLATE "Sunrise" "Sonnenaufgang"
+TRANSLATE "Sunset" "Sonnenuntergang"

include/translations/nl/sun.rem

@@ -0,0 +1,2 @@
+TRANSLATE "Sunrise" "Zonsopgang"
+TRANSLATE "Sunset" "Zonsondergang"