Revert accidental reset of translations. (#41)

- Modified build system to not re-generate strings in every translation file
  in every build.

translations/CMakeLists.txt

@@ -6,21 +6,33 @@ set_directory_properties (PROPERTIES CLEAN_NO_CUSTOM 1)
 
 include (TRANSLATION_FILES.txt)
 
-qt5_create_translation (glabels_qm_files
+#
+# Update strings in C-locale translation files (lupdate+lrelease)
+#
+qt5_create_translation (glabels_C_qm_file
   ${CMAKE_SOURCE_DIR}/glabels
   ${CMAKE_SOURCE_DIR}/model
   ${CMAKE_SOURCE_DIR}/backends
-  ${GLABELS_TS_FILES}
+  glabels_C.ts
   OPTIONS -no-obsolete -locations none
 )
-
-qt5_create_translation (templates_qm_files
+qt5_create_translation (templates_C_qm_file
   ${CMAKE_CURRENT_BINARY_DIR}/template-strings.h
-  ${TEMPLATES_TS_FILES}
+  templates_C.ts
   OPTIONS -no-obsolete -locations none
 )
 
-add_custom_target (update_translations DEPENDS ${glabels_qm_files} ${templates_qm_files})
+#
+# Generate QM files from all other language translation files (lrelease only)
+#
+qt5_add_translation (language_qm_files
+  ${GLABELS_TS_FILES}
+  ${TEMPLATES_TS_FILES}
+)
+
+add_custom_target (update_translations
+  DEPENDS ${glabels_C_qm_file} ${templates_C_qm_file} ${language_qm_files}
+)
 
 # Add updating translations as a dependency for glabels-qt
 add_dependencies (glabels-qt update_translations)
@@ -72,5 +84,6 @@ add_custom_target (template-strings DEPENDS template-strings.h)
 #=======================================
 # Install
 #=======================================
-install (FILES ${glabels_qm_files}   DESTINATION share/glabels-qt/translations)
-install (FILES ${templates_qm_files} DESTINATION share/glabels-qt/translations)
+install (FILES ${glabels_C_qm_file}   DESTINATION share/glabels-qt/translations)
+install (FILES ${templates_C_qm_file} DESTINATION share/glabels-qt/translations)
+install (FILES ${language_qm_files}   DESTINATION share/glabels-qt/translations)