Hi, I have not found a Spanish translation of the print dialog, then I have done and am available to whoever needs it.
Greetings.
The file is printer4lazstrconst.es.po
msgid ""
msgstr ""
"Content-Type: text/plain; charset=UTF-8\n"
"Project-Id-Version: \n"
"POT-Creation-Date: \n"
"PO-Revision-Date: \n"
"Last-Translator: \n"
"Language-Team: \n"
"MIME-Version: 1.0\n"
"Content-Transfer-Encoding: 8bit\n"
"X-Generator: Poedit 1.8.4\n"
"Plural-Forms: nplurals=2; plural=(n != 1);\n"
"Language: es\n"
#: printer4lazstrconst.p4lrsadvanced
msgid "Advanced"
msgstr "Avanzado"
#: printer4lazstrconst.p4lrsbanners
msgid "Banners"
msgstr "Banners"
#: printer4lazstrconst.p4lrscancel
msgid "Cancel"
msgstr "Cancelar"
#: printer4lazstrconst.p4lrsend
msgid "End"
msgstr "Fin"
#: printer4lazstrconst.p4lrsgeneral
msgid "General"
msgstr "General"
#: printer4lazstrconst.p4lrslandscape
msgid "Landscape"
msgstr "Horizontal"
#: printer4lazstrconst.p4lrsmargins
msgid "Margins"
msgstr "Márgenes"
#: printer4lazstrconst.p4lrsok
msgid "Ok"
msgstr "OK"
#: printer4lazstrconst.p4lrsorientation
msgid "Orientation"
msgstr "Orientación"
#: printer4lazstrconst.p4lrspagespersheet
msgid "Pages per sheet"
msgstr "Páginas por hoja"
#: printer4lazstrconst.p4lrspapersize
msgid "Paper size"
msgstr "Tamaño del papel"
#: printer4lazstrconst.p4lrspapersource
msgid "Paper source"
msgstr "Fuente del papel"
#: printer4lazstrconst.p4lrspapertype
msgid "Paper type"
msgstr "Tipo de papel"
Also file attached.
Lazarus 1.6 over GNU/Linux.