Parse header files for translatable strings

We previously parsed only .cpp files, but some strings are inlined in
header files.

cockatrice/CMakeLists.txt

@@ -101,8 +101,8 @@ set(cockatrice_RESOURCES cockatrice.qrc)
 FILE(GLOB cockatrice_TS "${CMAKE_CURRENT_SOURCE_DIR}/translations/*.ts")
 
 IF(UPDATE_TRANSLATIONS)
-    FILE(GLOB_RECURSE translate_cockatrice_SRCS ${CMAKE_SOURCE_DIR}/cockatrice/src/*.cpp)
-    FILE(GLOB_RECURSE translate_common_SRCS ${CMAKE_CURRENT_SOURCE_DIR}/common/*.cpp)
+    FILE(GLOB_RECURSE translate_cockatrice_SRCS ${CMAKE_SOURCE_DIR}/cockatrice/src/*.cpp ${CMAKE_SOURCE_DIR}/cockatrice/src/*.h)
+    FILE(GLOB_RECURSE translate_common_SRCS ${CMAKE_CURRENT_SOURCE_DIR}/common/*.cpp ${CMAKE_CURRENT_SOURCE_DIR}/common/*.h)
     SET(translate_SRCS ${translate_cockatrice_SRCS} ${translate_common_SRCS})
 ENDIF(UPDATE_TRANSLATIONS)