fix: adjustments to german grammar

[toniarndt]

The recommendations are summarized in the issue #356. I have also made adjustments to the german versions.

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[github-actions]

Hi there! 👋

Thank you for your contribution to the FIP Guide! 🚀
We appreciate your effort in making rail staff travel information more accessible. 🚄

Checklist before merging:

• Added a description to the Pull Request
• Checked the License of new pictures (non-commercial use without attribution)
• Modified content in English
• Modified content in German
• Modified content in French

[Copilot]

Pull Request Overview

This pull request introduces a German style guide and applies its typography and terminology standards across multiple content files. The changes focus on consistent formatting of currency values, proper terminology (replacing "Rabatt" with "Ermäßigung"), and correcting a spelling error.

• Adds a comprehensive German style guide covering typography, spacing, gender-neutral language, and punctuation
• Standardizes currency formatting with spaces between numbers and currency symbols (e.g., 10€ → 10 €)
• Replaces "Rabatt" with "Ermäßigung" for consistency in FIP discount terminology
• Corrects spelling error: "Freifahrtsschein" → "Freifahrtschein"

Reviewed Changes

Copilot reviewed 9 out of 13 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
styleguide_de.md	New German style guide document defining typography, spacing, and language standards
content/operator/sncf/index.de.md	Corrects spelling of "Freifahrtschein"
content/operator/oebb/index.de.md	Standardizes currency spacing and replaces "Rabatt" with "Ermäßigung"
content/operator/gysev/index.de.md	Replaces "Rabatt" with "Ermäßigung"
content/operator/eurostar/index.de.md	Standardizes currency spacing and replaces "Rabatt" with "Ermäßigung"
content/news/5/index.de.md	Standardizes currency spacing throughout
content/country/united-kingdom/index.de.md	Replaces "Rabatt" with "Ermäßigung" and adjusts grammatical agreement
content/country/switzerland/index.de.md	Standardizes currency spacing
content/country/italy/index.de.md	Standardizes currency spacing
content/country/france/index.de.md	Replaces "Rabatt" with "Ermäßigung" (appears twice)
content/country/austria/index.de.md	Standardizes currency spacing
content/booking/sncf-ticket-office/index.de.md	Replaces "Rabatt" with "Ermäßigung"
content/booking/sncf-phone/index.de.md	Replaces "Rabatt" with "Ermäßigung" (multiple instances)

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[therobrob]

Hi Toni, thanks a lot for the styleguide – i've done some content improvements with this :)

[MoritzWeber0]

The styleguide looks good in general. There will be some additional work to update the content to the new style. But this can be done afterwards in separate PRs.