Fix capitalization on buttons for the pipelines page
On the CI/CD Pipelines page the two buttons use capitalization that is inconsistent with the capitalization in the rest of the product. ![Pipelines___GitLab_org___GitLab___GitLab](/uploads/92717680e5b9238dd25daaabaa94ebd4/Pipelines___GitLab_org___GitLab___GitLab.png) The buttons should read "Run pipeline" and "CI lint". On the Jobs page, the button is correctly labeled "CI lint".
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