Update lng to lon for consistancy

[RubenSmn]

Description

Currently we are using both lon and lng in our code.
For consistancy we should update lng to lon since it is the most commonly used.

Reason: all the entities (trees) are using lon for coordinates.

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[RubenSmn]

Prerequisite: Greenstand/treetracker-web-map-core#127

[keyy123]

I would like to tackle this issue! @RubenSmn. Git won't allow me to push changes since I only changed the text :( .

[RubenSmn]

Hmm that is weird, so you can't make a PR?

PS before your changes get merged this requires for this to be merged 😉

[keyy123]

🤣 That's comedy. Alright, I will wait until the changes are pushed into web-map API @RubenSmn! Thank you for telling me!

[dadiorchen]

This is too difficult to change, let's close it for the time being