Fix some typos in translatable strings, and in some cases allowing to merge with similar already existent strings, reducing the translators work load and avoid inconsistenies.
[x] Fix lowercase api -> API (for consistency with the rest of the plugin strings)
[x] Fix additionnal -> additional
[x] Fix we recommend... -> We recommend... (First letter uppercase and merge to similar existent string)
Fix some typos in translatable strings, and in some cases allowing to merge with similar already existent strings, reducing the translators work load and avoid inconsistenies.
api->API(for consistency with the rest of the plugin strings)additionnal->additionalwe recommend...->We recommend...(First letter uppercase and merge to similar existent string)