Data Export Missing Translations

When requesting a bulk export of your data, there are missing translations in the 'activities.csv' file:
<span class="translation_missing" title="translation missing: en-US.lib.export.portability_exporter.activities.horton_values.type">Type</span>
<span class="translation_missing" title="translation missing: en-US.lib.export.portability_exporter.activities.horton_values.start_time">Start Time</span>
<span class="translation_missing" title="translation missing: en-US.lib.export.portability_exporter.activities.horton_values.jump_count">Jump Count</span>
<span class="translation_missing" title="translation missing: en-US.lib.export.portability_exporter.activities.horton_values.total_grit">Total Grit</span>
<span class="translation_missing" title="translation missing: en-US.lib.export.portability_exporter.activities.horton_values.avg_flow">Avg Flow</span>
<span class="translation_missing" title="translation missing: en-US.lib.export.portability_exporter.activities.horton_values.flagged">Flagged</span>
<span class="translation_missing" title="translation missing: en-US.lib.export.portability_exporter.activities.horton_values.avg_elapsed_speed">Avg Elapsed Speed</span>
<span class="translation_missing" title="translation missing: en-US.lib.export.portability_exporter.activities.horton_values.dirt_distance">Dirt Distance</span>
<span class="translation_missing" title="translation missing: en-US.lib.export.portability_exporter.activities.horton_values.newly_explored_distance">Newly Explored Distance</span>
<span class="translation_missing" title="translation missing: en-US.lib.export.portability_exporter.activities.horton_values.newly_explored_dirt_distance">Newly Explored Dirt Distance</span>
<span class="translation_missing" title="translation missing: en-US.lib.export.portability_exporter.activities.horton_values.sport_type">Sport Type</span>
<span class="translation_missing" title="translation missing: en-US.lib.export.portability_exporter.activities.horton_values.total_steps">Total Steps</span>