Try to get rid of explicit Gettext dependency

We are using Gettext via glib, no need to depend on it from CMake. Let's
see if this breaks for some systems.

CMakeLists.txt

@@ -204,24 +204,21 @@ endif(NOT EXTERNAL_PROGRAMS_FOUND)
 
 #need to put here do setting LOCALE_DIR variable
 if(USE_NLS)
-find_package(Gettext)
-if(Gettext_FOUND)
-	if(NOT LOCALE_DIR)
+  if(NOT LOCALE_DIR)
     SET(LOCALE_DIR "${CMAKE_INSTALL_PREFIX}/share/locale")
-	endif(NOT LOCALE_DIR)
-
-	if(NOT LOCALE_DIR)
-		message(QUIET "Set LOCALE_DIR to path to get Gettext working")
-	else()
-		find_package(Msgfmt)
-		if(Msgfmt_FOUND)
-			message(STATUS "Found msgfmt to convert language file. Translation enabled")
-			add_subdirectory(po)
-		else()
-			message(STATUS "Cannot find msgfmt to convert language file. Translation won't be enabled")
-		endif()
-	endif(NOT LOCALE_DIR)
-endif(Gettext_FOUND)
+  endif(NOT LOCALE_DIR)
+
+  if(NOT LOCALE_DIR)
+    message(QUIET "Set LOCALE_DIR to path to get Gettext working")
+  else()
+    find_package(Msgfmt)
+    if(Msgfmt_FOUND)
+      message(STATUS "Found msgfmt to convert language file. Translation enabled")
+      add_subdirectory(po)
+    else()
+      message(STATUS "Cannot find msgfmt to convert language file. Translation won't be enabled")
+    endif()
+  endif(NOT LOCALE_DIR)
 endif(USE_NLS)
 
 if(NOT DEFINED RUNTIME_LOCALE_DIR)

src/CMakeLists.txt

@@ -186,15 +186,8 @@ foreach(lib ${OUR_LIBS} LensFun GIO GThread GModule PangoCairo PThread Rsvg2 Lib
 endforeach(lib)
 
 if(USE_NLS)
-  find_package(Gettext)
-  if(Gettext_FOUND)
-    include_directories(SYSTEM ${Gettext_INCLUDE_DIRS})
-    list(APPEND LIBS ${Gettext_LIBRARIES})
-    add_definitions("-DUSE_GETTEXT")
-    message(STATUS "Internationalization: Enabled")
-  else()
-    message(STATUS "Internationalization: Disabled (libintl not found)")
-  endif()
+  add_definitions("-DUSE_GETTEXT")
+  message(STATUS "Internationalization: Enabled")
 endif(USE_NLS)
 
 if(USE_FLICKR)

src/cli/main.c

@@ -43,7 +43,6 @@
 #include <sys/time.h>
 #include <unistd.h>
 #include <inttypes.h>
-#include <libintl.h>
 
 static void generate_thumbnail_cache()
 {