Resolve "Generate runtime-error.po"

Closes #234 (closed)

xtask/res/templates/runtime-errors.po

+{% for pallet in pallets -%}
+{% for error in pallet.errors -%}
+
+msgid "{{ pallet.name }}.{{ error.name }}"
+msgstr "{{ error.documentation }}"
+{% endfor -%}
+{% endfor -%}