Dashboard: Update template descriptions

[BrittanyIRL]

Summary

Updates the descriptions associated with templates from lorem ipsum.

Relevant Technical Choices

• Updating text based on this document: https://docs.google.com/document/d/1tewOPzegX0QBcualXs7VMlgcCACwWAXiKRE3QFogNWM/edit?pli=1#
• Including i18n, i know the API will handle this for us, but figured this would be ok for the meantime.

User-facing changes

Testing Instructions

• Confirm that text is updated for each of the 8 templates in accordance with the above google doc

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Addresses #2687

[codecov]

Codecov Report

Merging #2818 into master will increase coverage by 1.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2818      +/-   ##
==========================================
+ Coverage   79.44%   80.49%   +1.04%     
==========================================
  Files         701      706       +5     
  Lines       11931    12008      +77     
==========================================
+ Hits         9479     9666     +187     
+ Misses       2452     2342     -110     

Flag	Coverage Δ
#karmatests	59.83% <ø> (+1.23%)	⬆️
#unittests	66.23% <ø> (+0.10%)	⬆️

Impacted Files	Coverage Δ
assets/src/dashboard/templates/index.js	25.00% <ø> (ø)
assets/src/edit-story/components/form/numeric.js	84.61% <0.00%> (-2.06%)	⬇️
...ory/components/library/panes/media/dropDownMenu.js	15.00% <0.00%> (-1.67%)	⬇️
...s/src/edit-story/components/panels/sizePosition.js	92.77% <0.00%> (-1.17%)	⬇️
...ts/src/edit-story/components/panels/panel/panel.js	65.90% <0.00%> (-0.76%)	⬇️
...ory/components/library/panes/media/mediaElement.js	87.87% <0.00%> (-0.19%)	⬇️
includes/Admin.php	0.00% <0.00%> (ø)
includes/Dashboard.php	68.67% <0.00%> (ø)
includes/Story_Post_Type.php	57.73% <0.00%> (ø)
assets/src/edit-story/masks/index.js	100.00% <0.00%> (ø)
... and 36 more

[github-actions]

Size Change: -1.15 kB (0%)

Total Size: 872 kB

Filename	Size	Change
assets/js/edit-story.js	389 kB	+1.5 kB (0%)
assets/js/stories-dashboard.js	466 kB	-2.65 kB (0%)

ℹ️ View Unchanged

Filename	Size	Change
assets/css/edit-story.css	269 B	0 B
assets/css/stories-dashboard.css	305 B	0 B
assets/css/web-stories-embed-block.css	515 B	0 B
assets/js/web-stories-embed-block.js	15.7 kB	0 B

_{compressed-size-action}

[mariano-formidable]

I know you copied and pasted the text from the google doc (as the typos exist there) but I found a couple typos for you to ponder over, and then it'll be good to go!