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LANGUAGE.md

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###Dowload###

You can download Language Pack File from https://lp.getpebble.com/v1/languages

Now there are files for German, Spanish, French, English and Chinese.

There are different files for specific hardware, but I found they seem identical although their filenames are different.

###Unpack###

Language Pack File has extension .pbl for filename, and it is just a special Pebble Resource File

You can unpack it by pbpack tool in Pebble SDK.

This script may help you: https://github.com/xndcn/pebble-firmware-utils/blob/for-language-pack/pbpack_tool.py

There will be 19 raw files unpacked from Language Pack File, named from 000, 001, to 018

###Localization###

The first file 000, is a GNU message catalog file, which should has an extension .mo usually

This file can be transformed to .po file by msgunfmt 000 -o 000.po

000.po will be a GNU gettext message file which contains original strings and localized translation.

You can change it and transform back by msgfmt 000.po -o 000

###Fonts###

The other files, 001 to 018, are either Pebble Font File or just empty file

You can extract codepoints from the font file by using https://github.com/xndcn/pebble-firmware-utils/blob/for-language-pack/extract_codepoints.py

And then you can replace the font file by fontgen.py in Pebble SDK with your favorite font.

However, I didn't find any font file from Language Pack File except Chinese

In Chinese pbl, there are 4 types font file.

001 and 002 are identical, which contains only 217 characters and their maximum height is 14. Especially, it nearly contains all chinese characters in 000.po.

003 and 004 are identical, which contains 9056 characters and their maximum height is 18.

005, 006, 007, 008 are identical, which also contains 9056 characters and their maximum height is 24.

016 contains only 12 characters for month names and its height is 21.

Other files are empty.

I think the order of font file is corresponding to its resource id:

File Font
001 GOTHIC_14
002 GOTHIC_14_BOLD
003 GOTHIC_18
004 GOTHIC_18_BOLD
005 GOTHIC_24
006 GOTHIC_24_BOLD
007 GOTHIC_28
008 GOTHIC_28_BOLD
009 BITHAM_30_BLACK
010 BITHAM_42_BOLD
011 BITHAM_42_LIGHT
012 BITHAM_42_MEDIUM_NUMBERS
013 BITHAM_34_MEDIUM_NUMBERS
014 BITHAM_34_LIGHT_SUBSET
015 BITHAM_18_LIGHT_SUBSET
016 ROBOTO_CONDENSED_21
017 ROBOTO_BOLD_SUBSET_49
018 DROID_SERIF_28_BOLD

###Conclusion### What can we do by modifying Language Pack File?

  1. You can do localization or custom system strings as you like.

  2. You can replace the system font with your favorite font.

At last, after changing those resources, you can repack to a new.pbl and put it inside your mobile phone, then you can open it by Pebble App to install.