[LyX/master] Auto-generate theorem caption defs also for secondary languages

[Juergen Spitzmueller]

commit 249070dfd844312bb8855e80527fb84ef0a934c3
Author: Juergen Spitzmueller <spitz at lyx.org>
Date:   Mon May 4 17:20:40 2026 +0200

    Auto-generate theorem caption defs also for secondary languages
    
    No need for BabelPreamble here

 lib/doc/Customization.lyx                          | 67 +++++++++++++++++++-
 lib/doc/de/Customization.lyx                       | 20 +++++-
 lib/layouts/theorems-ams-bytype.inc                | 39 ------------
 lib/layouts/theorems-ams-chap-bytype.inc           | 39 ------------
 lib/layouts/theorems-ams-extended-bytype.module    | 70 +++------------------
 .../theorems-ams-extended-chap-bytype.module       | 70 +++------------------
 lib/layouts/theorems-ams-extended.module           | 72 ++++------------------
 lib/layouts/theorems-ams.inc                       | 39 ------------
 lib/layouts/theorems-bytype.inc                    | 39 ------------
 lib/layouts/theorems-named.module                  |  3 -
 lib/layouts/theorems-starred.inc                   | 52 ++++------------
 lib/layouts/theorems.inc                           | 39 ------------
 lyx-devel.cflags                                   |  0
 lyx-devel.config                                   |  0
 lyx-devel.creator                                  |  0
 lyx-devel.cxxflags                                 |  0
 lyx-devel.files                                    |  0
 lyx-devel.includes                                 |  0
 src/LaTeXFeatures.cpp                              | 18 ++++++
 19 files changed, 143 insertions(+), 424 deletions(-)