diff --git a/po/LINGUAS b/po/LINGUAS
index 59b1ef5..1c2bd14 100644
--- a/po/LINGUAS
+++ b/po/LINGUAS
@@ -1,3 +1,4 @@
+cs
 fr
 nb
 ru
diff --git a/po/cs.po b/po/cs.po
new file mode 100644
index 0000000..0265bae
--- /dev/null
+++ b/po/cs.po
@@ -0,0 +1,261 @@
+# SOME DESCRIPTIVE TITLE.
+# Copyright (C) YEAR THE PACKAGE'S COPYRIGHT HOLDER
+# This file is distributed under the same license as the PACKAGE package.
+# David Štancl <dstancl@dstancl.cz>, 2011.
+#
+msgid ""
+msgstr ""
+"Project-Id-Version: PACKAGE VERSION\n"
+"Report-Msgid-Bugs-To: \n"
+"POT-Creation-Date: 2011-05-27 01:22+0200\n"
+"PO-Revision-Date: 2011-06-06 23:40+0100\n"
+"Last-Translator: David Štancl <dstancl@dstancl.cz>\n"
+"Language-Team: cs_CZ <czech@li.org>\n"
+"Language: \n"
+"MIME-Version: 1.0\n"
+"Content-Type: text/plain; charset=utf-8\n"
+"Content-Transfer-Encoding: 8bit\n"
+
+#: extension.js:73
+msgid "..."
+msgstr "..."
+
+#: extension.js:228
+msgid "Tornado"
+msgstr "Tornádo"
+
+#: extension.js:230
+msgid "Tropical storm"
+msgstr "Tropická bouře"
+
+#: extension.js:232
+msgid "Hurricane"
+msgstr "Hurikán"
+
+#: extension.js:234
+msgid "Severe thunderstorms"
+msgstr "Četné bouřky"
+
+#: extension.js:236
+msgid "Thunderstorms"
+msgstr "Bouřky"
+
+#: extension.js:238
+msgid "Mixed rain and snow"
+msgstr "Sníh s deštěm"
+
+#: extension.js:240
+msgid "Mixed rain and sleet"
+msgstr "Déšť a plískanice"
+
+#: extension.js:242
+msgid "Mixed snow and sleet"
+msgstr "Sníh a plískanice"
+
+#: extension.js:244
+msgid "Freezing drizzle"
+msgstr "Namrzající mrholení"
+
+#: extension.js:246
+msgid "Drizzle"
+msgstr "Mrholení"
+
+#: extension.js:248
+msgid "Freezing rain"
+msgstr "Namrzající déšť"
+
+#: extension.js:250
+#: extension.js:252
+msgid "Showers"
+msgstr "Sněžení"
+
+#: extension.js:254
+msgid "Snow flurries"
+msgstr "Sněhové přívaly"
+
+#: extension.js:256
+msgid "Light snow showers"
+msgstr "Mírné sněžení"
+
+#: extension.js:258
+msgid "Blowing snow"
+msgstr "Husté sněžení"
+
+#: extension.js:260
+msgid "Snow"
+msgstr "Sněžení"
+
+#: extension.js:262
+msgid "Hail"
+msgstr "Kroupy"
+
+#: extension.js:264
+msgid "Sleet"
+msgstr "Plískanice"
+
+#: extension.js:266
+msgid "Dust"
+msgstr "Prašno"
+
+#: extension.js:268
+msgid "Foggy"
+msgstr "Mlha"
+
+#: extension.js:270
+msgid "Haze"
+msgstr "Opar"
+
+#: extension.js:272
+msgid "Smoky"
+msgstr "Kouřmo"
+
+#: extension.js:274
+msgid "Blustery"
+msgstr "Bouřlivě"
+
+#: extension.js:276
+msgid "Windy"
+msgstr "Větrno"
+
+#: extension.js:278
+msgid "Cold"
+msgstr "Chladno"
+
+#: extension.js:280
+msgid "Cloudy"
+msgstr "Zataženo"
+
+#: extension.js:283
+msgid "Mostly cloudy"
+msgstr "Oblačno"
+
+#: extension.js:286
+#: extension.js:312
+msgid "Partly cloudy"
+msgstr "Polojasno"
+
+#: extension.js:288
+msgid "Clear"
+msgstr "Jasno"
+
+#: extension.js:290
+msgid "Sunny"
+msgstr "Slunečno"
+
+#: extension.js:293
+msgid "Fair"
+msgstr "Pěkně"
+
+#: extension.js:295
+msgid "Mixed rain and hail"
+msgstr "Déšť s kroupami"
+
+#: extension.js:297
+msgid "Hot"
+msgstr "Horko"
+
+#: extension.js:299
+msgid "Isolated thunderstorms"
+msgstr "Osamocené bouřky"
+
+#: extension.js:302
+msgid "Scattered thunderstorms"
+msgstr "Občasné bouřky"
+
+#: extension.js:304
+msgid "Scattered showers"
+msgstr "Občasné přeháňky"
+
+#: extension.js:306
+#: extension.js:310
+msgid "Heavy snow"
+msgstr "Husté sněžení"
+
+#: extension.js:308
+msgid "Scattered snow showers"
+msgstr "Občasné sněžení"
+
+#: extension.js:314
+msgid "Thundershowers"
+msgstr "Sněžné bouře"
+
+#: extension.js:316
+msgid "Snow showers"
+msgstr "Sněhové přeháňky"
+
+#: extension.js:318
+msgid "Isolated thundershowers"
+msgstr "Osamocené sněhové bouřky"
+
+#: extension.js:321
+msgid "Not available"
+msgstr "Není k dispozici"
+
+#: extension.js:336
+msgid "Monday"
+msgstr "Pondělí"
+
+#: extension.js:336
+msgid "Tuesday"
+msgstr "Úterý"
+
+#: extension.js:336
+msgid "Wednesday"
+msgstr "Středa"
+
+#: extension.js:336
+msgid "Thursday"
+msgstr "Čtvrtek"
+
+#: extension.js:336
+msgid "Friday"
+msgstr "Pátek"
+
+#: extension.js:336
+msgid "Saturday"
+msgstr "Sobota"
+
+#: extension.js:336
+msgid "Sunday"
+msgstr "Neděle"
+
+#: extension.js:392
+msgid "Today"
+msgstr "Dnes"
+
+#: extension.js:392
+msgid "Tomorrow"
+msgstr "Zítra"
+
+#: extension.js:429
+msgid "Loading current weather ..."
+msgstr "Načítá se aktuální počasí ..."
+
+#: extension.js:430
+msgid "Loading future weather ..."
+msgstr "Načítá se předpověď ..."
+
+#: extension.js:446
+msgid "Loading ..."
+msgstr "Načítá se ..."
+
+#: extension.js:449
+msgid "Please wait"
+msgstr "Čekejte"
+
+#: extension.js:467
+msgid "Temperature:"
+msgstr "Teplota:"
+
+#: extension.js:469
+msgid "Humidity:"
+msgstr "Vlhkost:"
+
+#: extension.js:471
+msgid "Pressure:"
+msgstr "Tlak:"
+
+#: extension.js:473
+msgid "Wind:"
+msgstr "Vítr:"
+