Correct some misspellings in field labels

Institution show pages:

• Open Athens => OpenAthens
• EZ Proxy => EZproxy

Institution edit pages:

• Open Athens => OpenAthens
• EzProxy => EZproxy
• EZ Proxy => EZproxy

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• https://www.openathens.net/
• https://www.oclc.org/en/ezproxy.html