I want to use this conky script: Conky Vision

But I don't want the days of the week to be displayed in English.
When I change my locale to another language, the day of today is displayed in that language but the 5-day names from the lower part of the image are always in English, even if I change the system language to something different.
I have also changed the system language but those days are still displayed in English.
What changes should I make to that script for it to follow the language I want?
The conkyrc file has this content:
# Conky settings #
background yes
update_interval 1
double_buffer yes
no_buffers yes
# Window specifications #
gap_x 0
gap_y 0
alignment middle_middle
minimum_size 600 460
maximum_width 600
own_window yes
own_window_type normal
own_window_transparent yes
own_window_hints undecorate,sticky,skip_taskbar,skip_pager,below
own_window_argb_visual yes
own_window_argb_value 255
#border_margin 0
#border_inner_margin 0
#border_outer_margin 0
# Graphics settings #
draw_shades no
draw_outline no
draw_borders no
draw_graph_borders no
# Text settings #
use_xft yes
xftalpha 0
xftfont Raleway:size=10
override_utf8_locale yes
imlib_cache_size 0
# Color scheme #
default_color FFFFFF
color1 FFFFFF
TEXT
\
#-----WOIED-----#
\
\
${execi 300 curl -s "http://weather.yahooapis.fr/forecastrss?w=615702&u=c" -o ~/.cache/weather.xml}\
\
\
#---Clock+Date---#
\
\
${font Raleway:weight=Light :size=100}${alignc}${time %H}${alignc}:${alignc}${time %M}
${font Raleway:weight=Light:size=32}${voffset -60}${alignc}${time %A %B %d}\
\
\
#---High Temperatures---#
\
\
${font Raleway:size=20}\
${voffset 76}${goto 40}${execi 300 grep "yweather:condition" ~/.cache/weather.xml | grep -o "temp=\"[^\"]*\"" | grep -o "\"[^\"]*\"" | grep -o "[^\"]*"}°
${font Raleway:weight=Light:size=14}\
${voffset -28}${goto 160}${execi 300 grep "yweather:forecast" ~/.cache/weather.xml | grep -o "high=\"[^\"]*\"" | grep -o "\"[^\"]*\"" | grep -o "[^\"]*" | awk 'NR==2'}°\
${goto 270}${execi 300 grep "yweather:forecast" ~/.cache/weather.xml | grep -o "high=\"[^\"]*\"" | grep -o "\"[^\"]*\"" | grep -o "[^\"]*" | awk 'NR==3'}°\
${goto 380}${execi 300 grep "yweather:forecast" ~/.cache/weather.xml | grep -o "high=\"[^\"]*\"" | grep -o "\"[^\"]*\"" | grep -o "[^\"]*" | awk 'NR==4'}°\
${goto 490}${execi 300 grep "yweather:forecast" ~/.cache/weather.xml | grep -o "high=\"[^\"]*\"" | grep -o "\"[^\"]*\"" | grep -o "[^\"]*" | awk 'NR==5'}°\
\
\
#---Low Temparatures---#
\
\
${font Raleway:weight=Light:size=10}\
${voffset 48}${goto 210}${execi 300 grep "yweather:forecast" ~/.cache/weather.xml | grep -o "low=\"[^\"]*\"" | grep -o "\"[^\"]*\"" | grep -o "[^\"]*" | awk 'NR==2'}°\
${goto 320}${execi 300 grep "yweather:forecast" ~/.cache/weather.xml | grep -o "low=\"[^\"]*\"" | grep -o "\"[^\"]*\"" | grep -o "[^\"]*" | awk 'NR==3'}°\
${goto 430}${execi 300 grep "yweather:forecast" ~/.cache/weather.xml | grep -o "low=\"[^\"]*\"" | grep -o "\"[^\"]*\"" | grep -o "[^\"]*" | awk 'NR==4'}°\
${goto 540}${execi 300 grep "yweather:forecast" ~/.cache/weather.xml | grep -o "low=\"[^\"]*\"" | grep -o "\"[^\"]*\"" | grep -o "[^\"]*" | awk 'NR==5'}°\
\
\
#---Name of the day---#
\
\
${font Raleway:weight=Light:size=14}\
${voffset 30}${goto 60}${execi 300 grep "yweather:forecast" ~/.cache/weather.xml | grep -o "day=\"[^\"]*\"" | grep -o "\"[^\"]*\"" | grep -o "[^\"]*" | awk 'NR==1' | tr '[a-z]' '[A-Z]'}\
${goto 170}${execi 300 grep "yweather:forecast" ~/.cache/weather.xml | grep -o "day=\"[^\"]*\"" | grep -o "\"[^\"]*\"" | grep -o "[^\"]*" | awk 'NR==2' | tr '[a-z]' '[A-Z]'}\
${goto 280}${execi 300 grep "yweather:forecast" ~/.cache/weather.xml | grep -o "day=\"[^\"]*\"" | grep -o "\"[^\"]*\"" | grep -o "[^\"]*" | awk 'NR==3' | tr '[a-z]' '[A-Z]'}\
${goto 390}${execi 300 grep "yweather:forecast" ~/.cache/weather.xml | grep -o "day=\"[^\"]*\"" | grep -o "\"[^\"]*\"" | grep -o "[^\"]*" | awk 'NR==4' | tr '[a-z]' '[A-Z]'}\
${goto 500}${execi 300 grep "yweather:forecast" ~/.cache/weather.xml | grep -o "day=\"[^\"]*\"" | grep -o "\"[^\"]*\"" | grep -o "[^\"]*" | awk 'NR==5' | tr '[a-z]' '[A-Z]'}\
\
\
#---Weather Icons---#
\
\
${execi 300 cp -f ~/.conky-vision-icons/$(grep "yweather:condition" ~/.cache/weather.xml | grep -o "code=\"[^\"]*\"" | grep -o "\"[^\"]*\"" | grep -o "[^\"]*").png ~/.cache/weather-1.png}${image ~/.cache/weather-1.png -p 61,260 -s 32x32}\
\
${execi 300 cp -f ~/.conky-vision-icons/$(grep "yweather:forecast" ~/.cache/weather.xml | grep -o "code=\"[^\"]*\"" | grep -o "\"[^\"]*\"" | grep -o "[^\"]*" | awk 'NR==2').png ~/.cache/weather-2.png}${image ~/.cache/weather-2.png -p 171,260 -s 32x32}\
\
${execi 300 cp -f ~/.conky-vision-icons/$(grep "yweather:forecast" ~/.cache/weather.xml | grep -o "code=\"[^\"]*\"" | grep -o "\"[^\"]*\"" | grep -o "[^\"]*" | awk 'NR==3').png ~/.cache/weather-3.png}${image ~/.cache/weather-3.png -p 281,260 -s 32x32}\
\
${execi 300 cp -f ~/.conky-vision-icons/$(grep "yweather:forecast" ~/.cache/weather.xml | grep -o "code=\"[^\"]*\"" | grep -o "\"[^\"]*\"" | grep -o "[^\"]*" | awk 'NR==4').png ~/.cache/weather-4.png}${image ~/.cache/weather-4.png -p 391,260 -s 32x32}\
\
${execi 300 cp -f ~/.conky-vision-icons/$(grep "yweather:forecast" ~/.cache/weather.xml | grep -o "code=\"[^\"]*\"" | grep -o "\"[^\"]*\"" | grep -o "[^\"]*" | awk 'NR==5').png ~/.cache/weather-5.png}${image ~/.cache/weather-5.png -p 501,260 -s 32x32}${font}${voffset -46}\
It seems related to the file ~/.cache/weather.xml (more details on that here).
This file contains lines like:
<yweather:forecast day="Fri" date="10 Jul 2015" low="14" high="26" text="Mostly Sunny" code="34" />
<yweather:forecast day="Sat" date="11 Jul 2015" low="15" high="27" text="Mostly Sunny" code="34" />
<yweather:forecast day="Sun" date="12 Jul 2015" low="14" high="22" text="Showers" code="11" />
<yweather:forecast day="Mon" date="13 Jul 2015" low="16" high="24" text="Cloudy" code="26" />
<yweather:forecast day="Tue" date="14 Jul 2015" low="12" high="23" text="AM Showers" code="39" />
I guess, as indicated in a comment, the commands under ---Name of the day---# in .conkyrc are writing and updating the lines in ~/.cache/weather.xml posted above (containing names of days in English). But as I see those commands just relate to the "yweather:forecast", which might mean that the days in English are written as they are grabbed by curl from the yahoo weather English_US website, and that's why they are in English.
But what intrigues me is that when I've first seen this conky was on a Spanish site where all was in Spanish. That PPA does not work anymore it seems.
I'm in elementary OS Freya (based on *ubuntu 14.04)