Review strings and fix typos on the app and the website if confirmed

[luixxiul]

• [ ] This is not a feature request (existing functionality does not work, not missing functionality). I will request features on forum or via support.
• [ ] I've searched and did not find a similar issue.

Bug in web app and website

Describe the bug Since I am not really supposed to create a PR to address ones directly, I want to ask the team to have a look at the typos and fix them by yourself.

• [ ] Fix "can not" to "cannot"
• [ ] Fix "paidEmailDomainSignup_msg": remove a redundant whitespace character
• [x] Fix "businessFaq.store_markdown": the string "on or own" should be "on our own" instead
• [x] Fix "landing.faq_where_msg": the string "on or own" should be "on our own" instead
• [x] Fix "businessShowcase.invite_msg": the string "one tab" should be "one tap" instead
• [ ] Review "calendarFeature.multiUser_msg": the string "few tabs" should be "few taps" instead ? Note there has been a comment on it since one month.
• [ ] Fix "metaTags.protonmailTitle_msg": "tutanota"
• [ ] Fix "zoho.differences_markdown": "tutanota"
• [ ] Fix "gmail.summary_title": "tutanota"
• [ ] Fix "protonmail.comp_title": "tutanota"
• [ ] Fix "proton.summary_title": "tutanota"
• [ ] Fix "faq.login_markdown", "faq.nav_markdown", "faq.2factor_markdown", "faq.reset_markdown": clicking on *More* is not correct since it is no longer available on the actual UI
• [ ] Remove strings related to Secure Connect
• [ ] Review "faq.whitelabeling_markdown": "login.tutanota.com" should be "login.tuta.com" ?
• [ ] Review "faq.uninstall-desktop_markdown": "tutanota" ?
• [ ] Review "faq.install-desktop_markdown": "tutanota" ?
• [ ] Update "yahoo.differences_markdown": In addition, Tuta Mail is already exploring ways to update its encryption with [post-quantum cryptography] -> the cryptography has been implemented according to the home page
• [ ] Update "faq.how-to-forward_markdown": remove anchor links to https://tuta.com/best-fastmail-alternative#switch
• [x] Update "faq.how-to-forward_markdown": remove anchor links to https://tuta.com/posteo#switch, https://tuta.com/riseup#switch, and https://tuta.com/web#switch
• [ ] Remove a bunch strings for mail service comparisons, which we no longer have on https://tuta.com/email-comparison, such as "web.differences_markdown", "web.comp_title", "web.comparison_title", "web.forward_markdown", "skiff.differences_markdown", "skiff.comp_title", "skiff.comparison_title", "skiff.us_markdown", "skiff.us_title", "skiff.summary_title", "metaTags.skiffTitle_msg", "skiff.differences_title", "posteo.comp_title", "posteo.comparison_title", "posteo.forward_markdown", "fastmail.comp_title", "fastmail.comparison_title", "fastmail.comparisonEmailPic_msg", "fastmail.comparisonEmailPic_title", "fastmail.forward_markdown", "fastmail.summary_markdown", "metaTags.fastmailDescription_msg", "hushmail.comp_title", "startmail.comp_title", "riseup.comparison_title", "riseup.forward_markdown", etc (please look up for others). To be honest, it is annoying to finish translations of them only to find that many of them have been removed from there.

Expected behavior

They should be fixed or at least you would need to appoint someone to Phrase for replying to comments in a prompt and timely manner, please.

Screenshots: irrelevant

Desktop (please complete the following information): irrelevant

Smartphone (please complete the following information): irrelevant

Additional context

[luixxiul]

zoho.differences_markdown is also outdated in that it mentions Secure Connect and whistleblower features, which no longer are available.

Fix: plus an exclusive feature that lacks from Zoho’s offer, Secure Connect, an end-to-end encrypted contact form for your website or intranet, which doubles as a whistleblower system.

[luixxiul]

Edited the first post to add a checkbox to each item.