[Android Apps and Games] billy.bong:
For anyone who find the language packages, you can download it from swiftkey's repository below

Afrikaans

http://skslm.swiftkey.net/sony/downloads/sksdk-1.5/af_ZA.zip

Azərbaycanca

http://skslm.swiftkey.net/sony/downloads/sksdk-1.5/az_AZ.zip

Bahasa Indonesia

http://skslm.swiftkey.net/sony/downloads/sksdk-1.5/id_ID.zip

Bahasa Melayu

http://skslm.swiftkey.net/sony/downloads/sksdk-1.5/ms_MY.zip

Bahasa Melayu

http://skslm.swiftkey.net/sony/downloads/sksdk-1.5/ms_MY.zip

Basa Jawa

http://skslm.swiftkey.net/sony/downloads/sksdk-1.5/jv_ID.zip

Basa Sunda

http://skslm.swiftkey.net/sony/downloads/sksdk-1.5/su_ID.zip

Bosanski

http://skslm.swiftkey.net/sony/downloads/sksdk-1.5/bs_BA.zip

Catala

http://skslm.swiftkey.net/sony/downloads/sksdk-1.5/ca_ES.zip

Český

http://skslm.swiftkey.net/sony/downloads/sksdk-1.5/cs_CZ.zip

Cymraeg

http://skslm.swiftkey.net/sony/downloads/sksdk-1.5/cy_GB.zip

Dansk

http://skslm.swiftkey.net/sony/downloads/sksdk-1.5/da_DK.zip

Deutsch

http://skslm.swiftkey.net/sony/downloads/sksdk-1.5/de_DE.zip

Eesti

http://skslm.swiftkey.net/sony/downloads/sksdk-1.5/et_EE.zip

English (AU)

http://skslm.swiftkey.net/sony/downloads/sksdk-1.5/en_AU.zip

English (CA)

http://skslm.swiftkey.net/sony/downloads/sksdk-1.5/en_CA.zip

English (UK)

http://skslm.swiftkey.net/sony/downloads/sksdk-1.5/en_GB.zip

English (US)

http://skslm.swiftkey.net/sony/downloads/sksdk-1.5/en_US.zip

Español (América Latina)

http://skslm.swiftkey.net/sony/downloads/sksdk-1.5/es_LA.zip

Español (ES)

http://skslm.swiftkey.net/sony/downloads/sksdk-1.5/es_ES.zip

Español (US)

http://skslm.swiftkey.net/sony/downloads/sksdk-1.5/es_US.zip

Euskara

http://skslm.swiftkey.net/sony/downloads/sksdk-1.5/eu_ES.zip

Français (CA)

http://skslm.swiftkey.net/sony/downloads/sksdk-1.5/fr_CA.zip

Français (FR)

http://skslm.swiftkey.net/sony/downloads/sksdk-1.5/fr_FR.zip

aeilge

http://skslm.swiftkey.net/sony/downloads/sksdk-1.5/ga_IE.zip

Galego

http://skslm.swiftkey.net/sony/downloads/sksdk-1.5/gl_ES.zip

Hinglish

http://skslm.swiftkey.net/sony/downloads/sksdk-1.5/hg_IN.zip

Hrvatski

http://skslm.swiftkey.net/sony/downloads/sksdk-1.5/hr_HR.zip

Íslenska

http://skslm.swiftkey.net/sony/downloads/sksdk-1.5/is_IS.zip

Italiano

http://skslm.swiftkey.net/sony/downloads/sksdk-1.5/it_IT.zip

Latviešu

http://skslm.swiftkey.net/sony/downloads/sksdk-1.5/lv_LV.zip

Lietuvių

http://skslm.swiftkey.net/sony/downloads/sksdk-1.5/lt_LT.zip

Magyar

http://skslm.swiftkey.net/sony/downloads/sksdk-1.5/hu_HU.zip

Nederlands

http://skslm.swiftkey.net/sony/downloads/sksdk-1.5/nl_NL.zip

Norsk

http://skslm.swiftkey.net/sony/downloads/sksdk-1.5/nb_NO.zip

O'zbekcha

http://skslm.swiftkey.net/sony/downloads/sksdk-1.5/uz_UZ.zip

Polski

http://skslm.swiftkey.net/sony/downloads/sksdk-1.5/pl_PL.zip

O'zbekcha

http://skslm.swiftkey.net/sony/downloads/sksdk-1.5/uz_UZ.zip

Português (BR)

http://skslm.swiftkey.net/sony/downloads/sksdk-1.5/pt_BR.zip

Português (PT)

http://skslm.swiftkey.net/sony/downloads/sksdk-1.5/pt_PT.zip

Română

http://skslm.swiftkey.net/sony/downloads/sksdk-1.5/ro_RO.zip

Shqip

http://skslm.swiftkey.net/sony/downloads/sksdk-1.5/sq_AL.zip

Slovenčina

http://skslm.swiftkey.net/sony/downloads/sksdk-1.5/sk_SK.zip

Slovenščina

http://skslm.swiftkey.net/sony/downloads/sksdk-1.5/sl_SI.zip

Srpski

http://skslm.swiftkey.net/sony/downloads/sksdk-1.5/sr_RS.zip

Suomi

http://skslm.swiftkey.net/sony/downloads/sksdk-1.5/fi_FI.zip

Svenska

http://skslm.swiftkey.net/sony/downloads/sksdk-1.5/sv_SE.zip

Tagalog

http://skslm.swiftkey.net/sony/downloads/sksdk-1.5/tl_PH.zip

Tiếng Việt

http://skslm.swiftkey.net/sony/downloads/sksdk-1.5/vi_VN.zip

Türkçe

http://skslm.swiftkey.net/sony/downloads/sksdk-1.5/tr_TR.zip

Ελληνικά

http://skslm.swiftkey.net/sony/downloads/sksdk-1.5/el_GR.zip

Беларуская

http://skslm.swiftkey.net/sony/downloads/sksdk-1.5/be_BY.zip

Български

http://skslm.swiftkey.net/sony/downloads/sksdk-1.5/bg_BG.zip

Қазақ

http://skslm.swiftkey.net/sony/downloads/sksdk-1.5/kk_KZ.zip

Македонски

http://skslm.swiftkey.net/sony/downloads/sksdk-1.5/mk_MK.zip

Русский

http://skslm.swiftkey.net/sony/downloads/sksdk-1.5/ru_RU.zip

Татарча

http://skslm.swiftkey.net/sony/downloads/sksdk-1.5/tt_RU.zip

Тоҷикӣ

http://skslm.swiftkey.net/sony/downloads/sksdk-1.5/tg_TJ.zip

Українська

http://skslm.swiftkey.net/sony/downloads/sksdk-1.5/uk_UA.zip

ქართული

http://skslm.swiftkey.net/sony/downloads/sksdk-1.5/ka_GE.zip

Հայերեն

http://skslm.swiftkey.net/sony/downloads/sksdk-1.5/hy_AM.zip

עברית

http://skslm.swiftkey.net/sony/downloads/sksdk-1.5/he_IL.zip

اردو

http://skslm.swiftkey.net/sony/downloads/sksdk-1.5/ur_PK.zip

لعربية

http://skslm.swiftkey.net/sony/downloads/sksdk-1.5/ar_SA.zip

فارسی

http://skslm.swiftkey.net/sony/downloads/sksdk-1.5/fa_IR.zip

a मराठी

http://skslm.swiftkey.net/sony/downloads/sksdk-1.5/mr_IN.zip

a हिन्दी

http://skslm.swiftkey.net/sony/downloads/sksdk-1.5/hi_IN.zip

a বাংলা

http://skslm.swiftkey.net/sony/downloads/sksdk-1.5/bn_IN.zip

a ਪੰਜਾਬੀ

http://skslm.swiftkey.net/sony/downloads/sksdk-1.5/pa_IN.zip

a ગુજરાતી

http://skslm.swiftkey.net/sony/downloads/sksdk-1.5/gu_IN.zip

a தமிழ்

http://skslm.swiftkey.net/sony/downloads/sksdk-1.5/ta_IN.zip

a తెలుగు

http://skslm.swiftkey.net/sony/downloads/sksdk-1.5/te_IN.zip

a ಕನ್ನಡ

http://skslm.swiftkey.net/sony/downloads/sksdk-1.5/kn_IN.zip

a മലയാളം

http://skslm.swiftkey.net/sony/downloads/sksdk-1.5/ml_IN.zip

a ไทย

http://skslm.swiftkey.net/sony/downloads/sksdk-1.5/th_TH.zip

a 한국어

http://skslm.swiftkey.net/sony/downloads/sksdk-1.5/ko_KR.zip

I'm not sure if this installation method work for you, but I need someone who want to test it.

Make sure you have any file explorer with root-exploring ability (for ex. root explorer).

In this installation method, I'll use English(UK) as an example.

First, download the language package and put it on your phone's storage.

Extract that package. (If you use Root Explorer, it will automatically bundle the files in a folder, don't rename that folder! )

Go to /data/data/com.sonyericsson.textinput.uxp/files/ .

Create a folder on it with the folder's name as same as the package file name you've downloaded, ofcourse without extension. In this example we must create a folder with it's name

en_GB

. (If you use Root Explorer, skip this step, just move the folder from extracted package to this location.)

Set the permissions for this folder to

0700 rwx------

.

Go to inside en_GB folder.

Set all permissions for the files insidie this folder to

0600 rw-------

.

Now open the Xperia Keyboard's settings. Go to Language settings. You should can see the English(UK)(EN) in the Available section, you can enable it. But if you still get FC, I don't know how to enable it because I'd tried anything but still can't enable it.