🚀 [Story performance] Remove unused strings from localization bundles

[mszylkowski]

We can remove 5 strings from all localization bundles and deprecate 11 strings from the strings.js map.

Closes #37197

dist/v0/amp-story-0.1.mjs: Δ -1.20KB
dist/v0/amp-story-1.0.mjs: Δ -1.20KB
dist/v0/amp-story-0.1.js: Δ -1.37KB
dist/v0/amp-story-1.0.js: Δ -1.37KB

Also will remove strings from system layer redesign on: #37218

[amp-owners-bot]

Hey @gmajoulet, @newmuis! These files were changed:

extensions/amp-story/1.0/_locales/af.json
extensions/amp-story/1.0/_locales/am.json
extensions/amp-story/1.0/_locales/ar.json
extensions/amp-story/1.0/_locales/bg.json
extensions/amp-story/1.0/_locales/bn.json
extensions/amp-story/1.0/_locales/bs.json
extensions/amp-story/1.0/_locales/ca.json
extensions/amp-story/1.0/_locales/cs.json
extensions/amp-story/1.0/_locales/da.json
extensions/amp-story/1.0/_locales/de.json
extensions/amp-story/1.0/_locales/el.json
extensions/amp-story/1.0/_locales/en-GB.json
+60 more