Almost complete the i18n system, including:

Copy unifont..ttf.gz from source tree to target datafile path( now ONLY works with cmake );
Set the locale the same with system's setting;
If need unicode font, unzip and load unifont when init ui styles;
Apply gettext() to labels in space_info.py, who are the main menu items.

Each of these should have been commit one by one. As they work well according to my tests, so I just lazily send a long list.

4 files changed, 95 insertions, 12 deletions

diff --git a/source/blender/editors/datafiles/CMakeLists.txt b/source/blender/editors/datafiles/CMakeLists.txt
index a359b0ef6f5..b0c74ca12fc 100644
--- a/source/blender/editors/datafiles/CMakeLists.txt
+++ b/source/blender/editors/datafiles/CMakeLists.txt
@@ -19,8 +19,10 @@
 #
 # ***** END GPL LICENSE BLOCK *****
 
-set(INC "")
-
+set(INC
+	../../blenlib
+	../../../../intern/guardedalloc
+)
 set(SRC
 	Bfont.c
 	add.png.c
@@ -29,6 +31,7 @@ set(SRC
 	blob.png.c
 	blur.png.c
 	bmonofont.ttf.c
+	bunifont.ttf.c
 	clay.png.c
 	clone.png.c
 	crease.png.c
diff --git a/source/blender/editors/datafiles/bunifont.ttf.c b/source/blender/editors/datafiles/bunifont.ttf.c
new file mode 100755
index 00000000000..dd2acb0cb52
--- /dev/null
+++ b/source/blender/editors/datafiles/bunifont.ttf.c
@@ -0,0 +1,40 @@
+/** \file blender/editors/datafiles/bunifont.ttf.c
+ *  \ingroup eddatafiles
+ */
+/* DataToC output of file <bfont_ttf> */
+
+#include <zlib.h>
+#include <stdio.h>
+#include "BLI_path_util.h"
+#include "BLI_string.h"
+#include "BLI_fileops.h"
+#include "BLI_memarena.h"
+#include "MEM_guardedalloc.h"
+
+const int datatoc_bunifont_ttf_size = 16336376;
+static char* datatoc_bunifont_ttf = 0;
+
+static char unifont_path[1024];
+static char unifont_filename[]="unifont-5.1.20080907.ttf.zip";
+
+char *get_datatoc_bunifont_ttf(void)
+{
+    if( datatoc_bunifont_ttf==NULL )
+    {
+        char *fontpath = BLI_get_folder(BLENDER_DATAFILES, "fonts");
+        BLI_snprintf( unifont_path, sizeof(unifont_path), "%s/%s", fontpath, unifont_filename );
+
+        if( BLI_exists(unifont_path) )
+        {
+			datatoc_bunifont_ttf = (char*)MEM_mallocN( datatoc_bunifont_ttf_size, "get_datatoc_bunifont_ttf" );
+			BLI_ungzip_to_mem( unifont_path, datatoc_bunifont_ttf, datatoc_bunifont_ttf_size );
+        }
+    }
+    return datatoc_bunifont_ttf;
+}
+
+void free_datatoc_bunifont_ttf(void)
+{
+	if( datatoc_bunifont_ttf!=NULL )
+		MEM_freeN( datatoc_bunifont_ttf );
+}
diff --git a/source/blender/editors/include/ED_datafiles.h b/source/blender/editors/include/ED_datafiles.h
index ee29df3fffb..6831f80092c 100644
--- a/source/blender/editors/include/ED_datafiles.h
+++ b/source/blender/editors/include/ED_datafiles.h
@@ -56,6 +56,9 @@ extern char datatoc_bfont_ttf[];
 extern int datatoc_bmonofont_ttf_size;
 extern char datatoc_bmonofont_ttf[];
 
+extern int datatoc_bunifont_ttf_size;
+extern char* get_datatoc_bunifont_ttf();
+
 /* Brush icon datafiles */
 /* TODO: this could be simplified by putting all
    the brush icons in one file */
diff --git a/source/blender/editors/interface/interface_style.c b/source/blender/editors/interface/interface_style.c
index 2e4106b3c04..9ebf7c9cd4f 100644
--- a/source/blender/editors/interface/interface_style.c
+++ b/source/blender/editors/interface/interface_style.c
@@ -76,7 +76,7 @@
 
 /* ********************************************** */
 
-static uiStyle *ui_style_new(ListBase *styles, const char *name)
+static uiStyle *ui_style_new(ListBase *styles, const char *name, short fontid)
 {
 	uiStyle *style= MEM_callocN(sizeof(uiStyle), "new style");
 	
@@ -85,7 +85,7 @@ static uiStyle *ui_style_new(ListBase *styles, const char *name)
 	
 	style->panelzoom= 1.0;
 
-	style->paneltitle.uifont_id= UIFONT_DEFAULT;
+	style->paneltitle.uifont_id= fontid;
 	style->paneltitle.points= 12;
 	style->paneltitle.kerning= 1;
 	style->paneltitle.shadow= 1;
@@ -94,7 +94,7 @@ static uiStyle *ui_style_new(ListBase *styles, const char *name)
 	style->paneltitle.shadowalpha= 0.15f;
 	style->paneltitle.shadowcolor= 1.0f;
 	
-	style->grouplabel.uifont_id= UIFONT_DEFAULT;
+	style->grouplabel.uifont_id= fontid;
 	style->grouplabel.points= 12;
 	style->grouplabel.kerning= 1;
 	style->grouplabel.shadow= 3;
@@ -102,7 +102,7 @@ static uiStyle *ui_style_new(ListBase *styles, const char *name)
 	style->grouplabel.shady= -1;
 	style->grouplabel.shadowalpha= 0.25f;
 	
-	style->widgetlabel.uifont_id= UIFONT_DEFAULT;
+	style->widgetlabel.uifont_id= fontid;
 	style->widgetlabel.points= 11;
 	style->widgetlabel.kerning= 1;
 	style->widgetlabel.shadow= 3;
@@ -111,7 +111,7 @@ static uiStyle *ui_style_new(ListBase *styles, const char *name)
 	style->widgetlabel.shadowalpha= 0.15f;
 	style->widgetlabel.shadowcolor= 1.0f;
 	
-	style->widget.uifont_id= UIFONT_DEFAULT;
+	style->widget.uifont_id= fontid;
 	style->widget.points= 11;
 	style->widget.kerning= 1;
 	style->widget.shadowalpha= 0.25f;
@@ -295,6 +295,7 @@ void uiStyleInit(void)
 {
 	uiFont *font= U.uifonts.first;
 	uiStyle *style= U.uistyles.first;
+	char *lang_set= BLF_lang_get();
 	
 	/* recover from uninitialized dpi */
 	if(U.dpi == 0)
@@ -335,11 +336,7 @@ void uiStyleInit(void)
 			BLF_size(font->blf_id, 14, U.dpi);
 		}
 	}
-	
-	if(style==NULL) {
-		ui_style_new(&U.uistyles, "Default Style");
-	}
-	
+
 	// XXX, this should be moved into a style, but for now best only load the monospaced font once.
 	if (blf_mono_font == -1)
 		blf_mono_font= BLF_load_mem_unique("monospace", (unsigned char *)datatoc_bmonofont_ttf, datatoc_bmonofont_ttf_size);
@@ -351,6 +348,46 @@ void uiStyleInit(void)
 		blf_mono_font_render= BLF_load_mem_unique("monospace", (unsigned char *)datatoc_bmonofont_ttf, datatoc_bmonofont_ttf_size);
 
 	BLF_size(blf_mono_font_render, 12, 72);
+
+	/* XXX Maybe it's bad to do this */
+	if(style==NULL) {
+		if( strcmp(lang_set,"hr.UTF-8")==0
+			|| strcmp(lang_set,"ar.UTF-8")==0
+			|| strcmp(lang_set,"bg.UTF-8")==0
+			|| strcmp(lang_set,"ca.UTF-8")==0
+			|| strcmp(lang_set,"cs.UTF-8")==0
+			|| strcmp(lang_set,"de.UTF-8")==0
+			|| strcmp(lang_set,"el.UTF-8")==0
+			|| strcmp(lang_set,"es.UTF-8")==0
+			|| strcmp(lang_set,"fi.UTF-8")==0
+			|| strcmp(lang_set,"fr.UTF-8")==0
+			|| strcmp(lang_set,"it.UTF-8")==0
+			|| strcmp(lang_set,"ja.UTF-8")==0
+			|| strcmp(lang_set,"ko.UTF-8")==0
+			|| strcmp(lang_set,"pl.UTF-8")==0
+			|| strcmp(lang_set,"ro.UTF-8")==0
+			|| strcmp(lang_set,"ru.UTF-8")==0
+			|| strcmp(lang_set,"sr.UTF-8")==0
+			|| strcmp(lang_set,"sv.UTF-8")==0
+			|| strcmp(lang_set,"uk.UTF-8")==0
+			|| strcmp(lang_set,"zh_CN.UTF-8")==0
+			)
+		{
+			// load unifont only when need. It takes 15MB memories
+			// get_datatoc_bunifont_ttf() may return null, BLF_load_mem_unique() will handle it
+			if( blf_unifont == -1 )
+				blf_unifont= BLF_load_mem_unique("unifont", (unsigned char *)get_datatoc_bunifont_ttf(), datatoc_bunifont_ttf_size);
+			if( blf_unifont != -1 )
+			{
+				BLF_size(blf_unifont, 12, 72);
+				ui_style_new(&U.uistyles, "Unifont Style", blf_unifont );
+			}
+			else
+				ui_style_new(&U.uistyles, "Default Style", UIFONT_DEFAULT );
+		}
+		else
+			ui_style_new(&U.uistyles, "Default Style", UIFONT_DEFAULT );
+	}
 }
 
 void uiStyleFontSet(uiFontStyle *fs)