Fix spelling errors

* "unknow" -> "unknown"
* "occured" -> "occurred"

Remove some entries from PO files where these entries contain spelling errors
and there are other entries that are identical except for these mistakes.

Signed-off-by: Jeremy Sowden <jeremy@azazel.net>

WINGs/ChangeLog

@@ -140,7 +140,7 @@ Changes since wmaker 0.64.0:
 - Moved all internal handlers (timer, idle and input) to handlers.c
 - simplified wevent.c and wutil.c.
 - fixed handling of input with poll (was broken)
-- fixed mem leak that occured when input handling was done with poll
+- fixed mem leak that occurred when input handling was done with poll
 - simpler and more straightforward event handling for timer, idle, input
   and X events (also fixed some problems the old handling logic had)
 - moved timer, idle and input handler definitions and prototypes from

WINGs/po/nl.po

@@ -843,9 +843,6 @@ msgstr "Kon invoerbestand \"%s\" niet openen"
 msgid "Could not create target file \"%s\""
 msgstr "Kon doelbestand \"%s\" niet aanmaken"
 
-msgid "An error occured browsing '%s'."
-msgstr "Er trad 'n fout op bij bladeren door '%s'."
-
 msgid ""
 "invalid characted '%c' in arg-list for macro \"%s\" while expecting "
 "parameter name"
@@ -860,9 +857,6 @@ msgstr ""
 "ongeldig letterteken '%c' in arg.-lijst voor macro \"%s\", verwachtte ',' "
 "of ')'"
 
-msgid "unknow directive '#%s'"
-msgstr "onbekende aanwijzing '#%s'"
-
 msgid "found #%s but have no matching #if"
 msgstr "#%s gevonden, maar heeft geen bijbehorende #if"