Mostly to change "Register-true" to "Page line-spacing" in all help
pages where that term appears -- except for part of the Glossary,
where it is explained that "Page line-spacing" is the LO term for
"register-true". (It seemed better to leave the technical term
"register-true" in the Glossary for those who search for this
term -- so that they can find out the LO terminology).
Also update the help pages for Format - Page Style - Page,
Format - Paragraph - Indent & Spacing, and Attributes
(in Find-Replace), and "Printing with Page line-space"
to reflect correctly the changes in the UI (because of tdf#127279).
Also,
- added entry for 1.15 lines in Paragraph - Indent & Spacing
- updated dialog box label in Indent & Spacing
- updated menu label for "Edit - Links to External Files" in Glossary
- renamed German Id: registerhaltigkeit --> register-true
Also general cleanup
-add missing <menuitem>
-update to <h1>,<h2>,<h3>,<menuitem>,<tip>,<note> in various files
Change-Id: If031bc538ae6573976e557db1117584daeaa1f24
Reviewed-on: https://gerrit.libreoffice.org/c/help/+/103800
Tested-by: Jenkins
Reviewed-by: Seth Chaiklin <sdc.blanco@youmail.dk>
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