diff --git a/po/da.po b/po/da.po
new file mode 100644
index 0000000..2d6f7be
--- /dev/null
+++ b/po/da.po
@@ -0,0 +1,677 @@
+# POT file for the Sugar Calculate activity
+# Copyright (C) 2008 Jonas Smedegaard
+# This file is distributed under the same license as the Calculate package.
+# Jonas Smedegaard <dr@jones.dk>, 2008.
+msgid ""
+msgstr ""
+"Project-Id-Version: Calculate 19\n"
+"Report-Msgid-Bugs-To: \n"
+"POT-Creation-Date: 2008-01-26 11:55-0500\n"
+"PO-Revision-Date: 2008-04-23 16:13+0200\n"
+"Last-Translator: Jonas Smedegaard <dr@jones.dk>\n"
+"Language-Team: LANGUAGE <LL@li.org>\n"
+"MIME-Version: 1.0\n"
+"Content-Type: text/plain; charset=UTF-8\n"
+"Content-Transfer-Encoding: 8bit\n"
+"Plural-Forms: nplurals=2; plural=(n != 1);\n"
+
+#: activity/activity.info:2
+msgid "Calculate"
+msgstr "Regn"
+
+#: calculate.py:80
+#, python-format
+msgid "Equation.parse() string invalid (%s)"
+msgstr "Forkert Equation.parse() streng (%s)"
+
+#: calculate.py:210
+msgid "Available functions:"
+msgstr "Tilgængelige funktioner:"
+
+#: calculate.py:504
+#, python-format
+msgid "Writing to journal (%s)"
+msgstr "Skriver til logbog (%s)"
+
+#: calculate.py:522
+#, python-format
+msgid "Reading from journal (%s)"
+msgstr "Læser fra logbot (%s)"
+
+#: calculate.py:528
+msgid "Unable to determine version"
+msgstr "Kunne ikke afgøre version"
+
+#: calculate.py:533
+#, python-format
+msgid "Reading journal entry (version %s)"
+msgstr "Læser logindlæg (version %s)"
+
+#: calculate.py:538
+#, python-format
+msgid "State line invalid (%s)"
+msgstr "Statuslinje forkert (%s)"
+
+#: calculate.py:555
+#, python-format
+msgid "Unable to read journal entry, unknown version (%s)"
+msgstr "Kunne ikke læse logindlæg, ukendt version (%s)"
+
+#: calculate.py:788
+msgid "button_pressed(): invalid type"
+msgstr "button_pressed(): forkert type"
+
+#: eqnparser.py:58
+#, python-format
+msgid "level: %d, ofs %d"
+msgstr "niveau: %d, ofs %d"
+
+#: eqnparser.py:117
+#, python-format
+msgid "Error at %d"
+msgstr "Fejl ved %d"
+
+# Text assigned to the 'help' variable
+#: eqnparser.py:235
+msgid "help_var"
+msgstr "Brug help(test) til hjælp om 'test', eller help(index) for oversigten"
+
+#: eqnparser.py:353 eqnparser.py:354
+#, python-format
+msgid "Function '%s' not defined"
+msgstr "Funktion '%s' ikke defineret"
+
+#: eqnparser.py:359
+#, python-format
+msgid "Invalid number of arguments (%d instead of %d)"
+msgstr "Forkert antal argumenter (%d istedet for %d)"
+
+#: eqnparser.py:360
+#, python-format
+msgid "function takes %d args"
+msgstr "funktion tager %d argumenter"
+
+#: eqnparser.py:370 eqnparser.py:371
+#, python-format
+msgid "Unable to parse argument %d: '%s'"
+msgstr "Kunne ikke aflæse argument %d: '%s'"
+
+#: eqnparser.py:380
+#, python-format
+msgid "Function error: %s"
+msgstr "Funktionsfejl: %s"
+
+#: eqnparser.py:481
+#, python-format
+msgid "Variable '%s' not defined"
+msgstr "Variabel '%s' ikke defineret"
+
+#: eqnparser.py:516
+msgid "Parse error (right parenthesis)"
+msgstr "Aflæsningsfejl (højre parentes)"
+
+#: eqnparser.py:517 eqnparser.py:528 eqnparser.py:535 eqnparser.py:610
+msgid "Right parenthesis unexpected"
+msgstr "Right parenthesis unexpected"
+
+#: eqnparser.py:527
+msgid "Parse error (right parenthesis, no left_val)"
+msgstr "Aflæsningsfejl (højre parantes, ingen left_val)"
+
+#: eqnparser.py:541 eqnparser.py:542
+msgid "Number not expected"
+msgstr "Nummer ikke forventet"
+
+#: eqnparser.py:550
+msgid "Operator not expected"
+msgstr "Operator ikke forventet"
+
+#: eqnparser.py:596
+msgid "Invalid operator"
+msgstr "Forkert operator"
+
+#: eqnparser.py:603
+msgid "Operator expected"
+msgstr "Operator forventet"
+
+#: eqnparser.py:616
+msgid "_parse(): returning None"
+msgstr "_parse(): returnerer None"
+
+# -----------------------------------------
+# The help system uses topic msgid's that should be translated here.
+# -----------------------------------------
+#: eqnparserhelp.py:37
+msgid "help_acos"
+msgstr "acos(x), returnerer arc cosinus af x. Defineret for -1 <= x <= 1"
+
+#: eqnparserhelp.py:38
+msgid "help_and"
+msgstr ""
+
+#: eqnparserhelp.py:39
+msgid "help_asin"
+msgstr "asin(x), returnerer arc sinus af x. Defineret for -1 <= x <= 1"
+
+#: eqnparserhelp.py:40
+msgid "help_atan"
+msgstr ""
+
+# -----------------------------------------
+# The help system uses topic msgid's that should be translated here.
+# -----------------------------------------
+#: eqnparserhelp.py:41
+msgid "help_cos"
+msgstr ""
+
+# -----------------------------------------
+# The help system uses topic msgid's that should be translated here.
+# -----------------------------------------
+#: eqnparserhelp.py:42
+msgid "help_cosh"
+msgstr ""
+
+#: eqnparserhelp.py:43
+msgid "help_exp"
+msgstr "exp(x), returnerer e^x, eksampel: exp(1)"
+
+# -----------------------------------------
+# The help system uses topic msgid's that should be translated here.
+# -----------------------------------------
+#: eqnparserhelp.py:44
+msgid "help_fac"
+msgstr ""
+
+#: eqnparserhelp.py:45
+msgid "help_functions"
+msgstr "vis tilgængelige funktioner"
+
+#: eqnparserhelp.py:46
+msgid "help_ln"
+msgstr ""
+
+#: eqnparserhelp.py:47
+msgid "help_operators"
+msgstr "vis tilgængelige operatorer"
+
+# Text assigned to the 'help' variable
+#: eqnparserhelp.py:48
+msgid "help_or"
+msgstr ""
+
+#: eqnparserhelp.py:49
+msgid "help_plot"
+msgstr "plot(expression,range), plotter en funktion. Eksempel: plot(x^3,x=-2..2)"
+
+#: eqnparserhelp.py:50
+msgid "help_sin"
+msgstr ""
+
+#: eqnparserhelp.py:51
+msgid "help_sinh"
+msgstr ""
+
+#: eqnparserhelp.py:52
+msgid "help_sqrt"
+msgstr "sqrt(x), returnerer kvadratrod af x. Defineret for x >= 0"
+
+#: eqnparserhelp.py:53
+msgid "help_square"
+msgstr ""
+
+#: eqnparserhelp.py:54
+msgid "help_tan"
+msgstr ""
+
+#: eqnparserhelp.py:55
+msgid "help_tanh"
+msgstr ""
+
+#: eqnparserhelp.py:56
+msgid "help_test"
+msgstr "test er blot et eksempel på et hjælpeemne! Se help(index)"
+
+#: eqnparserhelp.py:57
+msgid "help_variables"
+msgstr "vis tilgængelige variable"
+
+# Text assigned to the 'help' variable
+#: eqnparserhelp.py:58
+msgid "help_xor"
+msgstr ""
+
+#: eqnparserhelp.py:69
+msgid "help_usage"
+msgstr "Brug help(test) til hjælp om 'test', eller help(index) for oversigten"
+
+# -----------------------------------------
+# End of help topics
+# -----------------------------------------
+#: eqnparserhelp.py:132
+msgid "Topics"
+msgstr "Emner"
+
+#: eqnparserhelp.py:143
+#, python-format
+msgid "No help about '%s' available, use help(index) for the index"
+msgstr "Ingen hjælp om '%s' tilgængelig, brug help(index) for oversigten"
+
+#: layout.py:60
+msgid "Edit"
+msgstr "Redigér"
+
+#: layout.py:61
+msgid "Algebra"
+msgstr "Algebra"
+
+#: layout.py:62
+msgid "Trigonometry"
+msgstr "Trigonometri"
+
+#: layout.py:63
+msgid "Boolean"
+msgstr "Logik"
+
+#: layout.py:64
+msgid "Constants"
+msgstr "Konstanter"
+
+#: layout.py:65
+msgid "Format"
+msgstr "Format"
+
+#: layout.py:86
+msgid "Label:"
+msgstr "Mærkat:"
+
+#: layout.py:118
+msgid "All equations"
+msgstr "Alle beregninger"
+
+#: layout.py:118
+msgid "My equations"
+msgstr "Mine beregninger"
+
+#: layout.py:120
+msgid "Show history"
+msgstr "Vis historie"
+
+#: layout.py:120
+msgid "Show variables"
+msgstr "Vis variable"
+
+#: mathlib.py:58
+msgid "thousand_sep"
+msgstr "."
+
+#: mathlib.py:63
+msgid "fraction_sep"
+msgstr ","
+
+#. TRANS: multiplication symbol (default: '*')
+#: mathlib.py:74
+msgid "mul_sym"
+msgstr "*"
+
+#. TRANS: division symbol (default: '/')
+#: mathlib.py:79
+msgid "div_sym"
+msgstr "÷"
+
+#: mathlib.py:132
+msgid "Undefined"
+msgstr ""
+
+#: mathlib.py:142
+msgid "Error: unsupported type"
+msgstr "Fejl: ikke-understøttet type"
+
+#: toolbars.py:36
+msgid "Help"
+msgstr "Hjælp"
+
+#: toolbars.py:86
+msgid "Copy"
+msgstr "Kopiér"
+
+#: toolbars.py:89
+msgid "Paste"
+msgstr "Sæt ind"
+
+#: toolbars.py:92
+msgid "Cut"
+msgstr "Klip"
+
+#: toolbars.py:99
+msgid "Square"
+msgstr ""
+
+#: toolbars.py:103
+msgid "Square root"
+msgstr "Kvadratrod"
+
+#: toolbars.py:109
+msgid "e to the power x"
+msgstr "e opløftet til x potens"
+
+#: toolbars.py:117
+msgid "Natural logarithm"
+msgstr "Naturlig logaritme"
+
+#: toolbars.py:123
+msgid "Factorial"
+msgstr ""
+
+#: toolbars.py:131
+msgid "Sine"
+msgstr "Sinus"
+
+#: toolbars.py:135
+msgid "Cosine"
+msgstr "Cosinus"
+
+#: toolbars.py:139
+msgid "Tangent"
+msgstr "Tangens"
+
+#: toolbars.py:145
+msgid "Arc sine"
+msgstr "Arc sinus"
+
+#: toolbars.py:149
+msgid "Arc cosine"
+msgstr "Arc cosinus"
+
+#: toolbars.py:153
+msgid "Arc tangent"
+msgstr "Arc tangens"
+
+#: toolbars.py:159
+msgid "Hyperbolic sine"
+msgstr "Hyperbolsk sinus"
+
+#: toolbars.py:163
+msgid "Hyperbolic cosine"
+msgstr "Hyperbolks cosinus"
+
+#: toolbars.py:167
+msgid "Hyperbolic tangent"
+msgstr "Hyperbolsk tangens"
+
+#: toolbars.py:175
+msgid "Logical and"
+msgstr "Logisk og (and)"
+
+#: toolbars.py:179
+msgid "Logical or"
+msgstr "Logisk eller (or)"
+
+#: toolbars.py:174
+msgid "Logical xor"
+msgstr "Logisk ikke-eller (xor)"
+
+#: toolbars.py:189
+msgid "Equals"
+msgstr "Lig"
+
+#: toolbars.py:192
+msgid "Not equals"
+msgstr "Ikke lig"
+
+#: toolbars.py:199
+msgid "Pi"
+msgstr "Pi"
+
+#: toolbars.py:202
+msgid "e"
+msgstr "e"
+
+#: toolbars.py:209
+msgid "Degrees"
+msgstr "Grader"
+
+#: toolbars.py:210
+msgid "Radians"
+msgstr "Radianer"
+
+#: eqnparser.py:33
+msgid "Parse error"
+msgstr "Aflæsningsfejl"
+
+#: eqnparser.py:249 eqnparserhelp.py:128
+msgid "Use help(test) for help about 'test', or help(index) for the index"
+msgstr "Brug help(test) til hjælp om 'test', eller help(index) for oversigten"
+
+#: eqnparser.py:504
+msgid "Left parenthesis unexpected"
+msgstr "Venstre parantes uventet"
+
+#: eqnparser.py:534
+msgid "Parse error (right parenthesis, no level to close)"
+msgstr "Aflæsningsfejl (højreparantes, intet niveau at lukke)"
+
+#: eqnparser.py:566
+msgid "Parse error: number or variable expected"
+msgstr "Aflæsningsfejl: nummer eller variabel forventet"
+
+#: eqnparser.py:567
+msgid "Number or variable expected"
+msgstr "Nummer eller variabel forventet"
+
+#. TRANS: It is possible to translate commands. However, I would highly
+#. recommend NOT doing so for mathematical functions like cos(). help(),
+#. functions() etc should be translated.
+#: eqnparserhelp.py:39
+msgid "acos"
+msgstr ""
+
+#: eqnparserhelp.py:40
+msgid ""
+"acos(x), return the arc cosine of x. This is the angle for which the cosine "
+"is x. Defined for -1 <= x < 1"
+msgstr ""
+
+#: eqnparserhelp.py:43
+msgid "and"
+msgstr ""
+
+#: eqnparserhelp.py:44
+msgid ""
+"and(x, y), logical and. Returns True if x and y are True, else returns False"
+msgstr ""
+
+#: eqnparserhelp.py:46
+msgid "asin"
+msgstr ""
+
+#: eqnparserhelp.py:47
+msgid ""
+"asin(x), return the arc sine of x. This is the angle for which the sine is "
+"x. Defined for -1 <= x <= 1"
+msgstr ""
+
+#: eqnparserhelp.py:50
+msgid "atan"
+msgstr ""
+
+#: eqnparserhelp.py:51
+msgid ""
+"atan(x), return the arc tangent of x. This is the angle for which the "
+"tangent is x. Defined for all x"
+msgstr ""
+
+#: eqnparserhelp.py:54
+msgid "cos"
+msgstr ""
+
+#: eqnparserhelp.py:55
+msgid ""
+"cos(x), return the cosine of x. This is the x-coordinate on the unit circle "
+"at the angle x"
+msgstr ""
+
+#: eqnparserhelp.py:58
+msgid "cosh"
+msgstr ""
+
+#: eqnparserhelp.py:59
+msgid ""
+"cosh(x), return the hyperbolic cosine of x. Given by (exp(x) + exp(-x)) / 2"
+msgstr ""
+
+#: eqnparserhelp.py:61
+msgid "exp"
+msgstr ""
+
+#: eqnparserhelp.py:62
+msgid "exp(x), return the natural exponent of x. Given by e^x"
+msgstr ""
+
+#: eqnparserhelp.py:64
+msgid "fac"
+msgstr ""
+
+#: eqnparserhelp.py:65
+msgid "fac(x), return the factorial of x. Given by x * (x - 1) * (x - 2) * ..."
+msgstr ""
+
+#. TRANS: This command is descriptive, so can be translated
+#: eqnparserhelp.py:68
+msgid "functions"
+msgstr "funktioner"
+
+#: eqnparserhelp.py:69
+msgid "functions(), return a list of all the functions that are defined"
+msgstr ""
+
+#: eqnparserhelp.py:71
+msgid "ln"
+msgstr ""
+
+#: eqnparserhelp.py:72
+msgid ""
+"ln(x), return the natural logarithm of x. This is the value for which the "
+"exponent exp() equals x. Defined for x >= 0."
+msgstr ""
+
+#. TRANS: This command is descriptive, so can be translated
+#: eqnparserhelp.py:76
+msgid "operators"
+msgstr "operatorer"
+
+#: eqnparserhelp.py:77
+msgid "operators(), return a list of the operators that are defined"
+msgstr ""
+
+#: eqnparserhelp.py:79
+msgid "or"
+msgstr ""
+
+#: eqnparserhelp.py:80
+msgid ""
+"or(x, y), logical or. Returns True if x and/or y are True, else return False"
+msgstr ""
+
+#: eqnparserhelp.py:82
+msgid "plot"
+msgstr ""
+
+#: eqnparserhelp.py:83
+msgid ""
+"plot(eqn, var=-a..b), plot the equation 'eqn' with the variable 'var' in the "
+"range from a to b"
+msgstr ""
+
+#: eqnparserhelp.py:86
+msgid "sin"
+msgstr ""
+
+#: eqnparserhelp.py:87
+msgid ""
+"sin(x), return the sine of x. This is the y-coordinate on the unit circle at "
+"the angle x"
+msgstr ""
+
+#: eqnparserhelp.py:90
+msgid "sinh"
+msgstr ""
+
+#: eqnparserhelp.py:91
+msgid ""
+"sinh(x), return the hyperbolic sine of x. Given by (exp(x) - exp(-x)) / 2"
+msgstr ""
+
+#: eqnparserhelp.py:93
+msgid "sqrt"
+msgstr ""
+
+#: eqnparserhelp.py:94
+msgid ""
+"sqrt(x), return the square root of x. This is the value for which the square "
+"equals x. Defined for x >= 0."
+msgstr ""
+
+#: eqnparserhelp.py:97
+msgid "square"
+msgstr ""
+
+#: eqnparserhelp.py:98
+msgid "square(x), return the square of x. Given by x * x"
+msgstr ""
+
+#: eqnparserhelp.py:101
+msgid "tan"
+msgstr ""
+
+#: eqnparserhelp.py:102
+msgid ""
+"tan(x), return the tangent of x. This is the slope of the line from the "
+"origin of the unit circle to the point on the unit circle defined by the "
+"angle x. Given by sin(x) / cos(x)"
+msgstr ""
+
+#: eqnparserhelp.py:106
+msgid "tanh"
+msgstr ""
+
+#: eqnparserhelp.py:107
+msgid "sinh(x), return the hyperbolic tangent of x. Given by sinh(x) / cosh(x)"
+msgstr "sinh(x) returnerer hyperbolsk tangens af x. Givet af sinh(x) / cosh(x)"
+
+#: eqnparserhelp.py:109
+msgid "test"
+msgstr ""
+
+#: eqnparserhelp.py:110
+msgid "This is just a test topic, use help(index) for the index"
+msgstr "Dette er blot et testemne, brug help(index) for oversigten"
+
+#. TRANS: This command is descriptive, so can be translated
+#: eqnparserhelp.py:113
+msgid "variables"
+msgstr "variable"
+
+#: eqnparserhelp.py:114
+msgid "variables(), return a list of the variables that are currently defined"
+msgstr "variables(), returnerer en liste over variable defineret i øjeblikket"
+
+#: eqnparserhelp.py:116
+msgid "xor"
+msgstr ""
+
+#: eqnparserhelp.py:117
+msgid ""
+"xor(x, y), logical xor. Returns True if either x is True (and y is False) or "
+"y is True (and x is False), else returns False"
+msgstr ""
+"xor(x, y), logisk ikke-eller (xor). Returnerer Sand hvis enten x is Sand (og "
+"y er Falsk) eller y er Sand (og x er Falsk), og returnerer ellers Falsk"
+
+#. TRANS: help(index), both 'index' and the translation  will work
+#: eqnparserhelp.py:131
+msgid "index"
+msgstr "oversigt"
+
+#: toolbars.py:113
+msgid "x to the power y"
+msgstr "x opløftet til y potens"