diff --git a/help/CMakeLists.txt b/help/CMakeLists.txt
index d30f0848..f1b6d75b 100644
--- a/help/CMakeLists.txt
+++ b/help/CMakeLists.txt
@@ -1,6 +1,6 @@
 cmake_minimum_required(VERSION 2.8)
 
-
+include(../i18n-tools/CommonI18N.cmake)
 include(../i18n-tools/HelpI18N.cmake)
 
 set(HELP_INSTALL_DATA_DIR  ${COLOBOT_INSTALL_DATA_DIR}/help)
diff --git a/i18n-tools/CommonI18N.cmake b/i18n-tools/CommonI18N.cmake
new file mode 100644
index 00000000..65c0ad8c
--- /dev/null
+++ b/i18n-tools/CommonI18N.cmake
@@ -0,0 +1,22 @@
+##
+# Common function used in other I18N CMake modules
+##
+
+##
+# Get language code from *.po file name e.g. "de.po" -> "de"
+##
+function(get_language_code result_language_code po_file)
+    get_filename_component(po_file_name ${po_file} NAME)
+    string(REPLACE ".po" "" language_code ${po_file_name})
+    set(${result_language_code} ${language_code} PARENT_SCOPE)
+endfunction()
+
+##
+# Get language char from *.po file name e.g. "de.po" -> "D"
+##
+function(get_language_char result_language_char po_file)
+    get_filename_component(po_file_name ${po_file} NAME)
+    string(REGEX REPLACE ".\\.po" "" language_char ${po_file_name})
+    string(TOUPPER ${language_char} language_char)
+    set(${result_language_char} ${language_char} PARENT_SCOPE)
+endfunction()
diff --git a/i18n-tools/HelpI18N.cmake b/i18n-tools/HelpI18N.cmake
index cef6e901..0a98df5d 100644
--- a/i18n-tools/HelpI18N.cmake
+++ b/i18n-tools/HelpI18N.cmake
@@ -8,8 +8,6 @@ if(NOT PO4A)
     message(WARNING "PO4A not found, help files will NOT be translated!")
 endif()
 
-set(HELP_I18N_WORK_DIR ${CMAKE_CURRENT_BINARY_DIR}/help-po)
-
 ##
 # Generate translated help files in separate directories per language
 ##
@@ -30,10 +28,7 @@ function(generate_help_i18n
     set(output_help_subdirs "")
     file(GLOB po_files ${po_dir}/*.po)
     foreach(po_file ${po_files})
-        get_filename_component(po_file_name ${po_file} NAME)
-        # get language letter e.g. "de.po" -> "d"
-        string(REGEX REPLACE ".\\.po" "" language_char ${po_file_name})
-        string(TOUPPER ${language_char} language_char)
+        get_language_char(language_char ${po_file})
         set(language_help_subdir ${work_dir}/${language_char})
         list(APPEND output_help_subdirs ${language_help_subdir})
     endforeach()
@@ -45,13 +40,9 @@ function(generate_help_i18n
 
         file(APPEND ${po4a_cfg_file} "\n[type:colobothelp] ${abs_source_help_file}")
         foreach(po_file ${po_files})
-            get_filename_component(po_file_name ${po_file} NAME)
-            # get language code e.g. "de.po" -> "de"
-            string(REPLACE ".po" "" language_code ${po_file_name})
-            # get language letter e.g. "de.po" -> "d"
-            string(REGEX REPLACE ".\\.po" "" language_char ${po_file_name})
-            string(TOUPPER ${language_char} language_char)
             # generated file for single language
+            get_language_code(language_code ${po_file})
+            get_language_char(language_char ${po_file})
             set(generated_help_file ${work_dir}/${language_char}/${help_file_name})
             file(APPEND ${po4a_cfg_file} " \\\n    ${language_code}:${generated_help_file}")
         endforeach()
diff --git a/i18n-tools/LevelsI18N.cmake b/i18n-tools/LevelsI18N.cmake
index be623b0a..8d18fe27 100644
--- a/i18n-tools/LevelsI18N.cmake
+++ b/i18n-tools/LevelsI18N.cmake
@@ -45,10 +45,8 @@ function(generate_chaptertitles_i18n
         file(APPEND ${po4a_cfg_file} "\n[type:colobotlevel] ${abs_source_chaptertitle_file}")
 
         foreach(po_file ${po_files})
-            get_filename_component(po_file_name ${po_file} NAME)
-            # get language code e.g. "de.po" -> "de"
-            string(REPLACE ".po" "" language_code ${po_file_name})
             # generated file for single language
+            get_language_code(language_code ${po_file})
             set(generated_language_file ${output_chaptertitle_file}.${language_code})
             file(APPEND ${po4a_cfg_file} " \\\n    ${language_code}:${generated_language_file}")
         endforeach()
@@ -130,9 +128,7 @@ function(generate_level_i18n
 
     file(GLOB po_files ${po_dir}/*.po)
     foreach(po_file ${po_files})
-        get_filename_component(po_file_name ${po_file} NAME)
-        # get language code e.g. "de.po" -> "de"
-        string(REPLACE ".po" "" language_code ${po_file_name})
+        get_language_code(language_code ${po_file})
         # generated file for single language
         set(generated_language_file ${output_level_file}.${language_code})
         file(APPEND ${po4a_cfg_file} " \\\n    ${language_code}:${generated_language_file}")
@@ -147,13 +143,9 @@ function(generate_level_i18n
 
         file(APPEND ${po4a_cfg_file} "\n[type:colobothelp] ${source_help_file}")
         foreach(po_file ${po_files})
-            get_filename_component(po_file_name ${po_file} NAME)
-            # get language code e.g. "de.po" -> "de"
-            string(REPLACE ".po" "" language_code ${po_file_name})
-            # get language letter e.g. "de.po" -> "d"
-            string(REGEX REPLACE ".\\.po" "" language_char ${po_file_name})
-            string(TOUPPER ${language_char} language_char)
             # generated file for single language
+            get_language_code(language_code ${po_file})
+            get_language_char(language_char ${po_file})
             string(REPLACE ".E." ".${language_char}." generated_help_file_name ${help_file_name})
             set(generated_help_file ${output_help_dir}/${generated_help_file_name})
             file(APPEND ${po4a_cfg_file} " \\\n    ${language_code}:${generated_help_file}")
diff --git a/levels/CMakeLists.txt b/levels/CMakeLists.txt
index 6b4764ad..191ace7b 100644
--- a/levels/CMakeLists.txt
+++ b/levels/CMakeLists.txt
@@ -1,5 +1,6 @@
 cmake_minimum_required(VERSION 2.8)
 
+include(../i18n-tools/CommonI18N.cmake)
 include(../i18n-tools/LevelsI18N.cmake)
 
 set(LEVEL_INSTALL_DATA_DIR ${COLOBOT_INSTALL_DATA_DIR}/levels)